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Introduction to electromagnetism

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433:. The numerical value of the electric field, also called the electric field strength, determines the strength of the electric force that a charged particle will feel in the field and the direction of the field determines which direction the force will be in. By convention, the direction of the electric field is the same as the direction of the force on positive charges and opposite to the direction of the force on negative charges. Because positive charges are repelled by other positive charges and are attracted to negative charges, this means the electric fields point away from positive charges and towards negative charges. These properties of the electric field are encapsulated in the equation for the electric force on a charge written in terms of the electric field: 403: 722: 394: 571: 810: 798: 843:, the positive charges seem closer together compared to the flowing electrons and so the wire seems positively charged. Therefore, in the electron's rest frame it feels no magnetic force (because it is not moving in its own frame) but it does feel an electric force due to the positively charged wire. This result from relativity proves that magnetic fields are just electric fields in a different reference frame (and vice versa) and so the two are different manifestations of the same underlying 378: 624:. According to Gauss's law for magnetism, the flow of magnetic field through a closed surface is always zero. This means that if there is a magnetic field, the flow into the closed surface will always cancel out with the flow out of the closed surface. This law has also been called "no magnetic monopoles" because it means that any magnetic flux flowing out of a closed surface must flow back into it, meaning that positive and negative magnetic poles must come together as a 1561: 1036: 1483: 861: 1426: 650: 1521: 1540: 1464: 1445: 641: 1502: 201: 559: 684:. If the wire is straight, then the magnetic field is curled around it like the gripped fingers in the right-hand rule. If the wire is wrapped into coils, then the magnetic field inside the coils points in a straight line like the outstretched thumb in the right-hand grip rule. When electric currents are used to produce a 753:. The observation that these wave solutions had a wave speed exactly equal to the speed of light led Maxwell to hypothesise that light is a form of electromagnetic radiation and to posit that other electromagnetic radiation could exist with different wavelengths. The existence of electromagnetic radiation was proved by 2246: 701:
states that a magnetic field can produce an electric current. For example, a magnet pushed in and out of a coil of wires can produce an electric current in the coils which is proportional to the strength of the magnet as well as the number of coils and the speed at which the magnet is inserted and
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to the flow of electrons and so are often used to cover conducting wires for safety. In insulators, electrons are tightly bound to atomic nuclei and the energy to free them is very high so they are not free to move and are resistive to induced movement by an external electric field. However, some
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is proportional to the amount of charge that is enclosed by that surface. This means that the greater the charge, the greater the electric field that is produced. It also has other important implications. For example, this law means that if there is no charge enclosed by the surface, then either
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where unmoving objects appear closer together to the observer in motion than to the observer at rest. Therefore, if an electron is moving at the same speed as the current in a neutral wire, then they experience the flowing electrons in the wire as standing still relative to it and the positive
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is the square of the distance between them. It describes the fact that like charges repel one another whereas opposite charges attract one another and that the stronger the charges of the particles, the stronger the force they exert on one another. The law is also an
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there is no electric field at all or, if there is a charge near to but outside of the closed surface, the flow of electric field into the surface must exactly cancel with the flow out of the surface. The second of Maxwell's equations is known as
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Because charges are free to move in a conductor, when they are disturbed by an external electric field they rearrange themselves such that the field that their configuration produces exactly cancels the external electric field inside the
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Together, Maxwell's equations provide a single uniform theory of the electric and magnetic fields and Maxwell's work in creating this theory has been called "the second great unification in physics" after the first great unification of
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around an iron core which strengthens the magnetic field produced because the iron core becomes magnetised. Maxwell's extension to the law states that a time-varying electric field can also generate a magnetic field. Similarly,
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If this were not the case, the field would have a nonzero component on the surface of the conductor, which would cause the charges in the conductor to move around until that component of the field is zero.
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of the dielectric and the capacitance increases. The maximum energy that can be stored by a capacitor is proportional to the capacitance and the square of the potential difference between the plates
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is the magnetic flux produced by the coil of wire. The inductance is a measure of the circuit's resistance to a change in current and so inductors with high inductances can also be used to oppose
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which means that the charge in a closed system (where no charges are leaving or entering) must remain constant. The fundamental law that describes the gravitational force on a massive object in
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Because the flow of magnetic field out of a closed surface must cancel with the flow into it, magnets must have both North and South poles which cannot be separated into monopoles.
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In some materials, the electrons are bound to the atomic nuclei and so are not free to move around but the energy required to set them free is low. In these materials, called
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If there is no charge enclosed by a closed surface, then the amount of electric field flowing into it must exactly cancel with the electric field flowing out of it.
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This follows from the first statement because the field is zero everywhere inside the conductor and therefore the potential is constant within the conductor too.
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is an electronic component that stores energy in a magnetic field inside a coil of wire. A current-carrying coil of wire induces a magnetic field according to
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are fields which are assigned both a numerical value and a direction at each point in space and time. Electric charges produce a vector field called the
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that stores electrical potential energy in an electric field between two oppositely charged conducting plates. If one of the conducting plates has a
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to the flow of electrons when cooled below a certain critical temperature. Superconductivity can only be explained by the quantum mechanical
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for a straight wire (left) and for a coiled wire (right). Electrical current passed through a wire coiled around an iron core can produce an
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states that the sum of the voltage in a closed loop around a circuit equals zero. This comes from the fact that the electric field is
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is the area of the plates, then there will be an electric field between them. The potential difference between two parallel plates
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are entities that interact with matter and can be described mathematically by assigning a value to each point in space and time.
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For parallel circuits, the voltage remains the same for each component and the currents and resistances are related as shown:
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and a simpler classical treatment can be applied. Further simplifications of treatment are possible in limited situations.
258: 2907: 2007:{\displaystyle V_{tot}=V_{1}+V_{2}+V_{3}+\ldots \qquad R_{tot}=R_{1}+R_{2}+R_{3}+\ldots \qquad I=I_{1}=I_{2}=I_{3}=\ldots } 698: 718:—the fourth and final of Maxwell's equations—which states that a time-varying magnetic field produces an electric field. 715: 113:
and thus magnetism is merely a side effect of electricity. The modern theoretical treatment of electromagnetism is as a
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The electric potential is the same everywhere inside the conductor and is constant across the surface of the conductor.
492: 3353:. The Manchester Physics Series. Phillips, W. R. (William Robert) (2nd ed.). Chichester : Wiley. pp. 41–42. 2588:. The Manchester Physics Series. Phillips, W. R. (William Robert) (2nd ed.). Chichester : Wiley. pp. 17–22. 252:
is the fundamental law that describes the force that charged objects exert on one another. It is given by the formula
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states that the current going into a junction (or node) must equal the current that leaves the node. This comes from
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which means that as the distance between two particles is doubled, the force on them is reduced by a factor of four.
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The force exerted on a positive charge by an electric field (left) and a magnetic field (right) combine to give the
2877:. The Manchester Physics Series. Phillips, W. R. (William Robert) (2nd ed.). Chichester : Wiley. p. 365. 2747:. The Manchester Physics Series. Phillips, W. R. (William Robert) (2nd ed.). Chichester : Wiley. p. 125. 2379: 1203: 1157: 588: 245: 188:. Quantum considerations are also necessary to explain the behaviour of many electronic devices, for instance the 3671: 3576: 1810: 968: 826:. According to special relativity, observers moving at different speeds relative to one another occupy different 714:
into low voltage electricity which can be safely used in homes. Maxwell's formulation of the law is given in the
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This article is about a conceptual understanding of the topic. For a more detailed mathematical treatment, see
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For series circuits, the current remains the same for each component and the voltages and resistances add up:
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which means that no matter the path taken, the potential at a point does not change when you get back there.
3607: 3586: 2331:. Halliday, David, 1916-2010., Resnick, Robert, 1923-2014. (9th ed.). Hoboken, NJ: Wiley. p. 578. 1256: 1003: 357: 209: 118: 30: 2967:"Introduction to the Electromagnetic Spectrum and Spectroscopy | Analytical Chemistry | PharmaXChange.info" 1027:
to allow them to store more electric potential energy in the electric field between the capacitor plates.
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bound pairs which do not follow this principle and this means that all the electrons can fall to the same
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Acts as a source of alternating current (AC), a varying current which periodically reverses direction
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If a dielectric is placed between the plates then the permittivity of free space is multiplied by the
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under the influence of an external electric field so that the charges are minutely displaced forming
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and the conductivity increases. Silicon is an example of a semiconductors that can be used to create
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when they are in a state of motion that will be felt by other charges that are in motion (as well as
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is a material that allows electrons to flow easily. The most effective conductors are usually
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The charges in a perfect conductor rearrange so that the electric field is always zero inside.
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in a series of experiments ranging from 1886 to 1889 in which he discovered the existence of
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so Ohm's law can be used to tell us the power of the circuit in terms of other quantities
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Stores energy in electric fields, stores charge, passes low frequency alternating current
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Acts as a source of direct current (DC), a constant current which points in one direction
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The combination of the electric and magnetic forces on a charged particle is called the
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Rules can also tell us how to add up quantities such as the current and voltage in
984: 426: 189: 137: 3195: 2642:"The Feynman Lectures on Physics Vol. II Ch. 4: Electrostatics, S5: The flux of E" 1638: 830:. If one observer is in motion relative to another observer then they experience 3533: 3491: 3291: 2837: 1161: 950: 778: 703: 133: 34: 1520: 1539: 1319: 1012: 840: 758: 738: 381: 94: 90: 3509: 3403: 3167: 3096: 3010: 2689: 2554: 2454: 2346: 2297: 888:
surrounded by a cloud of free electrons. Examples of good conductors include
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is fully described by the Lorentz force alongside a set of equations called
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Coulomb's law tells us that like charges repel and opposite charges attract.
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and, similarly to the first Gauss's law, it describes flux, but instead of
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according to which mass cannot be created or destroyed, there is also the
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As well as producing an electric field, charged particles will produce a
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through a surface is proportional to the charge enclosed by the surface.
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to low voltage, and vice versa. They are needed to convert high voltage
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can be described without reference to electricity or electromagnetism.
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objects. With few exceptions, quantum theory is only necessary at the
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In a dielectric material, an electric field can polarise the material.
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that create a positive and negative side. Dielectrics are used in
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The electric field is perpendicular to the surface of a conductor.
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is still an accurate approximation in most situations involving
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Light and magnetism are affections of the same substance (p.499)
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Allows current to flow easily in one direction but not another
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which become more conductive the more energy they receive from
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A further unification of electromagnetism came with Einstein's
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where the fields are largely confined around current carrying
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where the fields are largely confined around current carrying
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were studied separately and regarded as separate phenomena.
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Stores energy in magnetic fields, resists change in current
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Sears and Zemansky's University Physics with Modern Physics
680:. The direction of the magnetic field is given by Ampère's 702:
extracted from the coils. This principle is essential for
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Philosophical Transactions of the Royal Society of London
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so magnetic fields do not arise and are not considered.
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Non-technical introduction to topics in electromagnetism
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because they can be described fairly accurately by the
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was a form of electromagnetic wave, thus making all of
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The electric field is zero inside a perfect conductor.
317:{\displaystyle F=k_{\text{e}}{q_{1}q_{2} \over r^{2}}} 2024: 1831: 1734: 1703: 1664: 1259: 1206: 1079: 495: 489:. The strength of the force is given by the equation 439: 261: 81:
possible. Maxwell also postulated, correctly, that
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put the whole thing together in a unified theory of
3643: 3595: 3569: 3125:"What Metals Make Good Conductors of Electricity?" 2240: 2006: 1786: 1718: 1684: 1649:of a circuit by introducing the quantity known as 1382: 1355: 1291: 1237: 1190: 1148: 1115: 741:(where there are no charges or currents) produces 522: 454: 316: 2908:"A dynamical theory of the electromagnetic field" 2826:"Unification theories and a theory of everything" 900:. Wires in electronics are often made of copper. 692:. Electromagnets often use a wire curled up into 384:point from positive charges to negative charges. 228:, electromagnetism acts on all things that have 706:which are used to transform currents from high 672:The third of Maxwell's equations is called the 224:. Whereas gravity acts on all things that have 97:of the former is much longer than the latter. 2995:(Third ed.). Cambridge. pp. 235–68. 1116:{\displaystyle V={Qd \over \varepsilon _{0}A}} 53:discovered the converse, that magnetism could 3549: 1238:{\displaystyle C={\varepsilon _{0}A \over d}} 8: 3522:: CS1 maint: multiple names: authors list ( 3109:: CS1 maint: multiple names: authors list ( 2359:: CS1 maint: multiple names: authors list ( 1641:states the relationship between the current 550:from the direction of motion of the charge. 2282:(Third ed.). Cambridge. pp. 3–4. 1198:and for a parallel plate capacitor this is 595:. The first of these equations is known as 3556: 3542: 3534: 3416:: CS1 maint: location missing publisher ( 3388:(Third ed.). Cambridge. p. 374. 3180:: CS1 maint: location missing publisher ( 3152:(Third ed.). Cambridge. p. 129. 3023:: CS1 maint: location missing publisher ( 2702:: CS1 maint: location missing publisher ( 2674:(Third ed.). Cambridge. p. 322. 2567:: CS1 maint: location missing publisher ( 2539:(Third ed.). Cambridge. p. 277. 2467:: CS1 maint: location missing publisher ( 2363:) CS1 maint: numeric names: authors list ( 2310:: CS1 maint: location missing publisher ( 987:and move together uniformly in a current. 546:which is pointing in a direction of angle 2226: 2213: 2200: 2181: 2162: 2153: 2142: 2133: 2122: 2113: 2096: 2087: 2074: 2061: 2048: 2029: 2023: 1992: 1979: 1966: 1943: 1930: 1917: 1898: 1881: 1868: 1855: 1836: 1830: 1775: 1760: 1754: 1733: 1702: 1674: 1663: 1374: 1368: 1345: 1339: 1327: 1283: 1266: 1258: 1220: 1213: 1205: 1180: 1169: 1140: 1134: 1101: 1086: 1078: 737:. The solution to Maxwell's equations in 494: 438: 306: 295: 285: 278: 272: 260: 2439:(Third ed.). Cambridge. p. 7. 1401: 963:are materials that exhibit little to no 859: 720: 607:(or flow) of electric field through any 199: 2268: 903:The main properties of conductors are: 880:in which electrons delocalize from the 835:charges as contracted together. In the 45:discovered that the two were related – 3515: 3484:Young, H. D., Freedman, R. A. (2016). 3479: 3477: 3475: 3409: 3382:Purcell, Edward M. (21 January 2013). 3342: 3340: 3338: 3313: 3311: 3173: 3102: 3016: 2853: 2843: 2695: 2668:Purcell, Edward M. (21 January 2013). 2560: 2533:Purcell, Edward M. (21 January 2013). 2460: 2433:Purcell, Edward M. (21 January 2013). 2352: 2303: 2276:Purcell, Edward M. (21 January 2013). 1292:{\displaystyle E={\frac {1}{2}}CV^{2}} 2663: 2661: 2413:Georgia State University Hyperphysics 2257:List of textbooks on electromagnetism 735:Newton's law of universal gravitation 7: 2504: 2502: 2402: 2400: 2952:from the original on 28 July 2011. 1787:{\displaystyle P=IV=V^{2}/R=I^{2}R} 1577:Kirchhoff's junction rule (above): 851:Conductors, insulators and circuits 93:differ from light only in that the 1371: 1336: 124:In many situations of interest to 14: 3075:Hook, J. R., Hall, H. E. (2010). 2384:Michigan State University Physics 1071:can be derived mathematically as 828:observational frames of reference 523:{\displaystyle F=qvB\sin \theta } 1570: 1559: 808: 796: 648: 639: 628:and can never be separated into 603:. According to Gauss's law, the 569: 557: 401: 392: 73:existed, and the experiments of 2824:Editors, AccessScience (2014). 2176: 2086: 1955: 1893: 1601:Kirchhoff's loop rule (below): 1059:and the other has a charge of - 232:. Furthermore, as there is the 208:Electromagnetism is one of the 89:a branch of electromagnetism. 3347:Grant, I. S. (Ian S.) (1990). 2741:Grant, I. S. (Ian S.) (1990). 2582:Grant, I. S. (Ian S.) (1990). 1006:are material which are highly 1: 3564:Introductory science articles 3460:hyperphysics.phy-astr.gsu.edu 3436:hyperphysics.phy-astr.gsu.edu 3323:hyperphysics.phy-astr.gsu.edu 3272:hyperphysics.phy-astr.gsu.edu 2906:Maxwell, James Clerk (1865). 2805:hyperphysics.phy-astr.gsu.edu 2781:hyperphysics.phy-astr.gsu.edu 2722:hyperphysics.phy-astr.gsu.edu 2622:hyperphysics.phy-astr.gsu.edu 2514:hyperphysics.phy-astr.gsu.edu 2325:Walker, Jearl, 1945- (2011). 1149:{\textstyle \varepsilon _{0}} 688:in this way, it is called an 2777:"Magnets and Electromagnets" 1818:series and parallel circuits 1421:Impedes the flow of current 1129:is the plate separation and 824:special theory of relativity 373:Electric and magnetic fields 210:fundamental forces of nature 3268:"Conductors and Insulators" 3248:feynmanlectures.caltech.edu 3200:feynmanlectures.caltech.edu 3148:Purcell, Edward M. (2013). 3043:feynmanlectures.caltech.edu 2991:Purcell, Edward M. (2013). 2838:10.1036/1097-8542.BR0814141 2646:feynmanlectures.caltech.edu 2487:feynmanlectures.caltech.edu 144:deals only with stationary 3688: 1356:{\textstyle L=\Phi _{B}/I} 1314:. The greater the current 1158:permittivity of free space 1039:A parallel plate capacitor 699:Faraday's law of induction 589:Classical electromagnetism 18: 3490:(14th ed.). Boston: 3385:Electricity and magnetism 3224:American Chemical Society 3150:Electricity and magnetism 2993:Electricity and magnetism 2671:Electricity and magnetism 2536:Electricity and magnetism 2436:Electricity and magnetism 2279:Electricity and magnetism 1797:Kirchhoff's junction rule 971:which states that no two 969:Pauli exclusion principle 933:This is a restatement of 815:The electron's rest frame 614:Gauss's law for magnetism 534:is the force on a charge 466:is the force on a charge 49:give rise to magnetism. 3220:"How a Solar Cell Works" 1398:Other circuit components 763:electromagnetic spectrum 727:electromagnetic spectrum 716:Maxwell–Faraday equation 360:of the two charges, and 3296:Encyclopedia Britannica 2328:Fundamentals of physics 1440:Acts as a power source 246:Newton's law of gravity 119:quantum electrodynamics 77:confirmed this, making 69:further indicated that 57:electric currents, and 3623:mathematical formalism 3292:"Dielectric | physics" 2935:10.1098/rstl.1865.0008 2871:Grant, Ian S. (1990). 2380:"Electric field lines" 2242: 2008: 1788: 1720: 1686: 1543: 1524: 1505: 1486: 1467: 1448: 1429: 1384: 1383:{\textstyle \Phi _{B}} 1357: 1312:Ampère's circuital law 1293: 1239: 1192: 1150: 1117: 1040: 1000: 865: 729: 524: 456: 385: 318: 238:conservation of charge 205: 126:electrical engineering 33:of nature. Early on, 2378:Pumplin, Jon (2000). 2243: 2009: 1807:Kirchhoff's loop rule 1789: 1721: 1687: 1685:{\displaystyle I=V/R} 1542: 1523: 1504: 1485: 1466: 1447: 1428: 1385: 1358: 1294: 1249:relative permittivity 1240: 1193: 1151: 1118: 1038: 998: 863: 845:electromagnetic field 747:electromagnetic waves 724: 525: 470:in an electric field 457: 380: 319: 203: 71:electromagnetic waves 43:Hans Christian Ørsted 3494:. pp. 872–878. 2022: 1829: 1732: 1719:{\displaystyle P=IV} 1701: 1662: 1367: 1326: 1257: 1204: 1168: 1164:which is defined as 1133: 1077: 1049:electronic component 682:right-hand grip rule 660:right-hand grip rule 601:charge distributions 542:in a magnetic field 493: 455:{\displaystyle F=qE} 437: 382:Electric field lines 259: 234:conservation of mass 3078:Solid State Physics 2927:1865RSPT..155..459C 1801:charge conservation 1631:electrical networks 1392:alternating current 1011:insulators, called 884:, leaving positive 878:free electron model 593:Maxwell's equations 158:electrical networks 107:relativistic motion 105:arises through the 67:Maxwell's equations 59:James Clerk Maxwell 3618:general relativity 3063:Special Relativity 2971:pharmaxchange.info 2856:has generic name ( 2238: 2004: 1784: 1716: 1682: 1544: 1525: 1506: 1487: 1468: 1449: 1430: 1380: 1353: 1289: 1235: 1191:{\textstyle C=Q/V} 1188: 1146: 1113: 1041: 1001: 866: 832:length contraction 771:infrared radiation 730: 674:Ampère–Maxwell law 630:magnetic monopoles 520: 452: 386: 367:inverse square law 314: 206: 178:quantum mechanical 176:are the result of 170:Chemical reactions 31:fundamental forces 3659: 3658: 3651:systolic geometry 3635:quantum mechanics 3501:978-0-321-97361-0 3395:978-1-107-01402-2 3088:978-1-118-72347-0 3061:A. French (1968) 2681:978-1-107-01402-2 2546:978-1-107-01402-2 2510:"Magnetic forces" 2446:978-1-107-01402-2 2338:978-0-470-46911-8 2289:978-1-107-01402-2 2168: 2148: 2128: 2108: 1548: 1547: 1474:AC voltage source 1455:DC voltage source 1411:Schematic symbol 1322:which is defined 1274: 1233: 1111: 779:ultraviolet light 745:corresponding to 712:mains electricity 483:permanent magnets 312: 275: 242:classical physics 150:Permanent magnets 130:Classical physics 47:electric currents 3679: 3672:Electromagnetism 3603:electromagnetism 3558: 3551: 3544: 3535: 3528: 3527: 3521: 3513: 3481: 3470: 3469: 3467: 3466: 3456:"Electric Power" 3452: 3446: 3445: 3443: 3442: 3428: 3422: 3421: 3415: 3407: 3379: 3373: 3372: 3350:Electromagnetism 3344: 3333: 3332: 3330: 3329: 3315: 3306: 3305: 3303: 3302: 3288: 3282: 3281: 3279: 3278: 3264: 3258: 3257: 3255: 3254: 3240: 3234: 3233: 3231: 3230: 3216: 3210: 3209: 3207: 3206: 3192: 3186: 3185: 3179: 3171: 3145: 3139: 3138: 3136: 3135: 3121: 3115: 3114: 3108: 3100: 3072: 3066: 3059: 3053: 3052: 3050: 3049: 3035: 3029: 3028: 3022: 3014: 2988: 2982: 2981: 2979: 2978: 2963: 2957: 2956: 2951: 2912: 2903: 2897: 2896: 2874:Electromagnetism 2868: 2862: 2861: 2855: 2851: 2849: 2841: 2821: 2815: 2814: 2812: 2811: 2801:"Ferromagnetism" 2797: 2791: 2790: 2788: 2787: 2773: 2767: 2766: 2744:Electromagnetism 2738: 2732: 2731: 2729: 2728: 2714: 2708: 2707: 2701: 2693: 2665: 2656: 2655: 2653: 2652: 2638: 2632: 2631: 2629: 2628: 2614: 2608: 2607: 2585:Electromagnetism 2579: 2573: 2572: 2566: 2558: 2530: 2524: 2523: 2521: 2520: 2506: 2497: 2496: 2494: 2493: 2479: 2473: 2472: 2466: 2458: 2430: 2424: 2423: 2421: 2419: 2409:"Electric Field" 2404: 2395: 2394: 2392: 2390: 2375: 2369: 2368: 2358: 2350: 2322: 2316: 2315: 2309: 2301: 2273: 2247: 2245: 2244: 2239: 2231: 2230: 2218: 2217: 2205: 2204: 2192: 2191: 2169: 2167: 2166: 2154: 2149: 2147: 2146: 2134: 2129: 2127: 2126: 2114: 2109: 2107: 2106: 2088: 2079: 2078: 2066: 2065: 2053: 2052: 2040: 2039: 2013: 2011: 2010: 2005: 1997: 1996: 1984: 1983: 1971: 1970: 1948: 1947: 1935: 1934: 1922: 1921: 1909: 1908: 1886: 1885: 1873: 1872: 1860: 1859: 1847: 1846: 1793: 1791: 1790: 1785: 1780: 1779: 1764: 1759: 1758: 1725: 1723: 1722: 1717: 1691: 1689: 1688: 1683: 1678: 1645:and the voltage 1574: 1563: 1402: 1389: 1387: 1386: 1381: 1379: 1378: 1362: 1360: 1359: 1354: 1349: 1344: 1343: 1298: 1296: 1295: 1290: 1288: 1287: 1275: 1267: 1244: 1242: 1241: 1236: 1234: 1229: 1225: 1224: 1214: 1197: 1195: 1194: 1189: 1184: 1155: 1153: 1152: 1147: 1145: 1144: 1122: 1120: 1119: 1114: 1112: 1110: 1106: 1105: 1095: 1087: 812: 800: 678:electric current 652: 643: 573: 561: 529: 527: 526: 521: 461: 459: 458: 453: 405: 396: 340:Coulomb constant 323: 321: 320: 315: 313: 311: 310: 301: 300: 299: 290: 289: 279: 277: 276: 273: 180:interactions of 174:chemical bonding 146:electric charges 101:showed that the 63:electromagnetism 27:Electromagnetism 21:electromagnetism 3687: 3686: 3682: 3681: 3680: 3678: 3677: 3676: 3662: 3661: 3660: 3655: 3639: 3591: 3565: 3562: 3532: 3531: 3514: 3502: 3483: 3482: 3473: 3464: 3462: 3454: 3453: 3449: 3440: 3438: 3430: 3429: 3425: 3408: 3396: 3381: 3380: 3376: 3361: 3346: 3345: 3336: 3327: 3325: 3317: 3316: 3309: 3300: 3298: 3290: 3289: 3285: 3276: 3274: 3266: 3265: 3261: 3252: 3250: 3242: 3241: 3237: 3228: 3226: 3218: 3217: 3213: 3204: 3202: 3194: 3193: 3189: 3172: 3160: 3147: 3146: 3142: 3133: 3131: 3123: 3122: 3118: 3101: 3089: 3074: 3073: 3069: 3060: 3056: 3047: 3045: 3037: 3036: 3032: 3015: 3003: 2990: 2989: 2985: 2976: 2974: 2965: 2964: 2960: 2949: 2910: 2905: 2904: 2900: 2885: 2870: 2869: 2865: 2852: 2842: 2823: 2822: 2818: 2809: 2807: 2799: 2798: 2794: 2785: 2783: 2775: 2774: 2770: 2755: 2740: 2739: 2735: 2726: 2724: 2716: 2715: 2711: 2694: 2682: 2667: 2666: 2659: 2650: 2648: 2640: 2639: 2635: 2626: 2624: 2616: 2615: 2611: 2596: 2581: 2580: 2576: 2559: 2547: 2532: 2531: 2527: 2518: 2516: 2508: 2507: 2500: 2491: 2489: 2481: 2480: 2476: 2459: 2447: 2432: 2431: 2427: 2417: 2415: 2406: 2405: 2398: 2388: 2386: 2377: 2376: 2372: 2351: 2339: 2324: 2323: 2319: 2302: 2290: 2275: 2274: 2270: 2265: 2253: 2222: 2209: 2196: 2177: 2158: 2138: 2118: 2092: 2070: 2057: 2044: 2025: 2020: 2019: 1988: 1975: 1962: 1939: 1926: 1913: 1894: 1877: 1864: 1851: 1832: 1827: 1826: 1771: 1750: 1730: 1729: 1699: 1698: 1660: 1659: 1624: 1623: 1622: 1621: 1620: 1618: 1614: 1610: 1606: 1598: 1594: 1590: 1586: 1582: 1575: 1566: 1565: 1564: 1553: 1400: 1370: 1365: 1364: 1335: 1324: 1323: 1304: 1279: 1255: 1254: 1216: 1215: 1202: 1201: 1166: 1165: 1136: 1131: 1130: 1097: 1096: 1088: 1075: 1074: 1033: 993: 961:Superconductors 858: 853: 820: 819: 818: 817: 816: 813: 805: 804: 801: 670: 669: 668: 667: 655: 654: 653: 645: 644: 626:magnetic dipole 620:, it describes 581: 580: 579: 578: 577: 574: 566: 565: 562: 491: 490: 487:right-hand rule 435: 434: 419: 418: 417: 416: 408: 407: 406: 398: 397: 375: 355: 348: 337: 302: 291: 281: 280: 268: 257: 256: 248:. Analogously, 230:electric charge 198: 196:Electric charge 99:Albert Einstein 51:Michael Faraday 24: 17: 12: 11: 5: 3685: 3683: 3675: 3674: 3664: 3663: 3657: 3656: 3654: 3653: 3647: 3645: 3641: 3640: 3638: 3637: 3632: 3627: 3626: 3625: 3615: 3610: 3605: 3599: 3597: 3593: 3592: 3590: 3589: 3584: 3579: 3573: 3571: 3567: 3566: 3563: 3561: 3560: 3553: 3546: 3538: 3530: 3529: 3500: 3471: 3447: 3423: 3394: 3374: 3359: 3334: 3307: 3283: 3259: 3235: 3211: 3187: 3159:978-1107014022 3158: 3140: 3116: 3087: 3067: 3054: 3030: 3002:978-1107014022 3001: 2983: 2958: 2898: 2883: 2863: 2830:Access Science 2816: 2792: 2768: 2753: 2733: 2718:"Ampere's Law" 2709: 2680: 2657: 2633: 2609: 2594: 2574: 2545: 2525: 2498: 2474: 2445: 2425: 2396: 2370: 2337: 2317: 2288: 2267: 2266: 2264: 2261: 2260: 2259: 2252: 2249: 2237: 2234: 2229: 2225: 2221: 2216: 2212: 2208: 2203: 2199: 2195: 2190: 2187: 2184: 2180: 2175: 2172: 2165: 2161: 2157: 2152: 2145: 2141: 2137: 2132: 2125: 2121: 2117: 2112: 2105: 2102: 2099: 2095: 2091: 2085: 2082: 2077: 2073: 2069: 2064: 2060: 2056: 2051: 2047: 2043: 2038: 2035: 2032: 2028: 2003: 2000: 1995: 1991: 1987: 1982: 1978: 1974: 1969: 1965: 1961: 1958: 1954: 1951: 1946: 1942: 1938: 1933: 1929: 1925: 1920: 1916: 1912: 1907: 1904: 1901: 1897: 1892: 1889: 1884: 1880: 1876: 1871: 1867: 1863: 1858: 1854: 1850: 1845: 1842: 1839: 1835: 1783: 1778: 1774: 1770: 1767: 1763: 1757: 1753: 1749: 1746: 1743: 1740: 1737: 1715: 1712: 1709: 1706: 1697:is defined as 1681: 1677: 1673: 1670: 1667: 1627:Circuit theory 1616: 1612: 1608: 1604: 1596: 1592: 1588: 1584: 1580: 1576: 1569: 1568: 1567: 1558: 1557: 1556: 1555: 1554: 1552: 1549: 1546: 1545: 1536: 1533: 1527: 1526: 1517: 1514: 1508: 1507: 1498: 1495: 1489: 1488: 1479: 1476: 1470: 1469: 1460: 1457: 1451: 1450: 1441: 1438: 1432: 1431: 1422: 1419: 1413: 1412: 1409: 1408:Main function 1406: 1399: 1396: 1377: 1373: 1352: 1348: 1342: 1338: 1334: 1331: 1303: 1300: 1286: 1282: 1278: 1273: 1270: 1265: 1262: 1232: 1228: 1223: 1219: 1212: 1209: 1187: 1183: 1179: 1176: 1173: 1143: 1139: 1109: 1104: 1100: 1094: 1091: 1085: 1082: 1053:charge density 1032: 1029: 992: 989: 957:from the sun. 947:thermal energy 943:semiconductors 939: 938: 924: 918: 912: 857: 854: 852: 849: 814: 807: 806: 802: 795: 794: 793: 792: 791: 755:Heinrich Hertz 751:speed of light 743:wave equations 657: 656: 647: 646: 638: 637: 636: 635: 634: 609:closed surface 575: 568: 567: 563: 556: 555: 554: 553: 552: 519: 516: 513: 510: 507: 504: 501: 498: 479:magnetic field 451: 448: 445: 442: 431:electric field 410: 409: 400: 399: 391: 390: 389: 388: 387: 374: 371: 353: 346: 335: 331:is the force, 325: 324: 309: 305: 298: 294: 288: 284: 271: 267: 264: 197: 194: 154:Circuit theory 142:Electrostatics 111:electric field 103:magnetic field 75:Heinrich Hertz 29:is one of the 15: 13: 10: 9: 6: 4: 3: 2: 3684: 3673: 3670: 3669: 3667: 3652: 3649: 3648: 3646: 3642: 3636: 3633: 3631: 3628: 3624: 3621: 3620: 3619: 3616: 3614: 3611: 3609: 3606: 3604: 3601: 3600: 3598: 3594: 3588: 3585: 3583: 3580: 3578: 3575: 3574: 3572: 3568: 3559: 3554: 3552: 3547: 3545: 3540: 3539: 3536: 3525: 3519: 3511: 3507: 3503: 3497: 3493: 3489: 3488: 3480: 3478: 3476: 3472: 3461: 3457: 3451: 3448: 3437: 3433: 3427: 3424: 3419: 3413: 3405: 3401: 3397: 3391: 3387: 3386: 3378: 3375: 3370: 3366: 3362: 3360:0-471-92711-2 3356: 3352: 3351: 3343: 3341: 3339: 3335: 3324: 3320: 3319:"Dielectrics" 3314: 3312: 3308: 3297: 3293: 3287: 3284: 3273: 3269: 3263: 3260: 3249: 3245: 3239: 3236: 3225: 3221: 3215: 3212: 3201: 3197: 3191: 3188: 3183: 3177: 3169: 3165: 3161: 3155: 3151: 3144: 3141: 3130: 3126: 3120: 3117: 3112: 3106: 3098: 3094: 3090: 3084: 3080: 3079: 3071: 3068: 3064: 3058: 3055: 3044: 3040: 3034: 3031: 3026: 3020: 3012: 3008: 3004: 2998: 2994: 2987: 2984: 2972: 2968: 2962: 2959: 2955: 2948: 2944: 2940: 2936: 2932: 2928: 2924: 2920: 2916: 2909: 2902: 2899: 2894: 2890: 2886: 2884:0-471-92711-2 2880: 2876: 2875: 2867: 2864: 2859: 2847: 2839: 2835: 2831: 2827: 2820: 2817: 2806: 2802: 2796: 2793: 2782: 2778: 2772: 2769: 2764: 2760: 2756: 2754:0-471-92711-2 2750: 2746: 2745: 2737: 2734: 2723: 2719: 2713: 2710: 2705: 2699: 2691: 2687: 2683: 2677: 2673: 2672: 2664: 2662: 2658: 2647: 2643: 2637: 2634: 2623: 2619: 2618:"Gauss's Law" 2613: 2610: 2605: 2601: 2597: 2595:0-471-92711-2 2591: 2587: 2586: 2578: 2575: 2570: 2564: 2556: 2552: 2548: 2542: 2538: 2537: 2529: 2526: 2515: 2511: 2505: 2503: 2499: 2488: 2484: 2478: 2475: 2470: 2464: 2456: 2452: 2448: 2442: 2438: 2437: 2429: 2426: 2414: 2410: 2403: 2401: 2397: 2385: 2381: 2374: 2371: 2366: 2362: 2356: 2348: 2344: 2340: 2334: 2330: 2329: 2321: 2318: 2313: 2307: 2299: 2295: 2291: 2285: 2281: 2280: 2272: 2269: 2262: 2258: 2255: 2254: 2250: 2248: 2235: 2232: 2227: 2223: 2219: 2214: 2210: 2206: 2201: 2197: 2193: 2188: 2185: 2182: 2178: 2173: 2170: 2163: 2159: 2155: 2150: 2143: 2139: 2135: 2130: 2123: 2119: 2115: 2110: 2103: 2100: 2097: 2093: 2089: 2083: 2080: 2075: 2071: 2067: 2062: 2058: 2054: 2049: 2045: 2041: 2036: 2033: 2030: 2026: 2017: 2014: 2001: 1998: 1993: 1989: 1985: 1980: 1976: 1972: 1967: 1963: 1959: 1956: 1952: 1949: 1944: 1940: 1936: 1931: 1927: 1923: 1918: 1914: 1910: 1905: 1902: 1899: 1895: 1890: 1887: 1882: 1878: 1874: 1869: 1865: 1861: 1856: 1852: 1848: 1843: 1840: 1837: 1833: 1824: 1821: 1819: 1814: 1812: 1808: 1804: 1802: 1798: 1794: 1781: 1776: 1772: 1768: 1765: 1761: 1755: 1751: 1747: 1744: 1741: 1738: 1735: 1727: 1713: 1710: 1707: 1704: 1696: 1692: 1679: 1675: 1671: 1668: 1665: 1656: 1655: 1652: 1648: 1644: 1640: 1636: 1632: 1628: 1602: 1599: 1573: 1562: 1550: 1541: 1537: 1534: 1532: 1529: 1528: 1522: 1518: 1515: 1513: 1510: 1509: 1503: 1499: 1496: 1494: 1491: 1490: 1484: 1480: 1477: 1475: 1472: 1471: 1465: 1461: 1458: 1456: 1453: 1452: 1446: 1442: 1439: 1437: 1434: 1433: 1427: 1423: 1420: 1418: 1415: 1414: 1410: 1407: 1404: 1403: 1397: 1395: 1393: 1375: 1350: 1346: 1340: 1332: 1329: 1321: 1317: 1313: 1309: 1301: 1299: 1284: 1280: 1276: 1271: 1268: 1263: 1260: 1252: 1250: 1245: 1230: 1226: 1221: 1217: 1210: 1207: 1199: 1185: 1181: 1177: 1174: 1171: 1163: 1159: 1141: 1137: 1128: 1123: 1107: 1102: 1098: 1092: 1089: 1083: 1080: 1072: 1070: 1066: 1062: 1058: 1054: 1050: 1046: 1037: 1030: 1028: 1026: 1022: 1018: 1014: 1009: 1005: 997: 990: 988: 986: 982: 978: 977:quantum state 974: 970: 966: 962: 958: 956: 952: 948: 944: 936: 932: 930: 929:electric flux 925: 922: 919: 916: 913: 909: 906: 905: 904: 901: 899: 895: 891: 887: 883: 882:atomic nuclei 879: 875: 871: 862: 855: 850: 848: 846: 842: 838: 833: 829: 825: 811: 803:The lab frame 799: 790: 788: 784: 780: 776: 775:visible light 772: 768: 764: 760: 756: 752: 748: 744: 740: 736: 728: 723: 719: 717: 713: 709: 705: 700: 695: 691: 690:electromagnet 687: 683: 679: 675: 665: 664:electromagnet 661: 651: 642: 633: 631: 627: 623: 622:magnetic flux 619: 618:electric flux 615: 610: 606: 602: 598: 594: 590: 586: 585:Lorentz force 572: 560: 551: 549: 545: 541: 537: 533: 517: 514: 511: 508: 505: 502: 499: 496: 488: 484: 480: 475: 473: 469: 465: 449: 446: 443: 440: 432: 428: 427:Vector fields 424: 414: 413:Lorentz force 404: 395: 383: 379: 372: 370: 368: 363: 359: 352: 345: 341: 334: 330: 307: 303: 296: 292: 286: 282: 269: 265: 262: 255: 254: 253: 251: 250:Coulomb's law 247: 243: 239: 235: 231: 227: 223: 219: 215: 211: 202: 195: 193: 191: 187: 183: 179: 175: 171: 167: 163: 159: 155: 151: 147: 143: 139: 135: 131: 127: 122: 120: 116: 115:quantum field 112: 108: 104: 100: 96: 92: 88: 84: 80: 76: 72: 68: 64: 60: 56: 52: 48: 44: 40: 36: 32: 28: 22: 3613:gauge theory 3602: 3486: 3463:. 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Retrieved 2383: 2373: 2327: 2320: 2278: 2271: 2018: 2015: 1825: 1822: 1815: 1811:conservative 1805: 1795: 1728: 1693: 1657: 1653: 1646: 1642: 1625: 1600: 1578: 1551:Circuit laws 1315: 1305: 1253: 1246: 1200: 1126: 1124: 1073: 1068: 1064: 1060: 1056: 1042: 1002: 985:energy level 959: 940: 926: 920: 914: 907: 902: 867: 821: 731: 704:transformers 671: 582: 547: 543: 539: 535: 531: 476: 471: 467: 463: 421:In physics, 420: 361: 350: 343: 332: 328: 326: 218:strong force 207: 190:tunnel diode 138:atomic scale 123: 26: 25: 3644:Mathematics 3432:"Ohm's Law" 2921:: 459–512. 2854:|last= 1658:Ohm's law: 1629:deals with 1162:capacitance 1013:dielectrics 951:solar cells 761:. The full 759:radio waves 597:Gauss's law 538:with speed 156:deals with 134:macroscopic 91:Radio waves 35:electricity 3465:2020-11-27 3441:2020-11-27 3328:2020-11-27 3301:2020-11-27 3277:2020-11-27 3253:2020-11-26 3229:2020-11-26 3205:2020-11-26 3134:2020-11-27 3048:2018-10-30 2977:2020-11-26 2810:2020-11-27 2786:2020-11-27 2727:2020-11-27 2651:2020-11-27 2627:2018-10-30 2519:2020-11-26 2492:2018-10-30 2418:16 October 2389:18 October 2263:References 1651:resistance 1635:conductors 1405:Component 1320:inductance 1031:Capacitors 1025:capacitors 1004:Insulators 991:Insulators 965:resistance 935:Gauss' law 911:conductor. 856:Conductors 841:rest frame 787:gamma rays 767:microwaves 739:free space 358:magnitudes 222:weak force 212:alongside 162:conductors 95:wavelength 3577:evolution 3518:cite book 3510:897436903 3412:cite book 3404:805015622 3176:cite book 3168:805015622 3129:Sciencing 3105:cite book 3097:868939953 3019:cite book 3011:805015622 2943:186207827 2698:cite book 2690:805015622 2563:cite book 2555:805015622 2463:cite book 2455:805015622 2407:Nave, R. 2355:cite book 2347:435710913 2306:cite book 2298:805015622 2236:… 2174:… 2084:… 2002:… 1953:… 1891:… 1639:Ohm's law 1512:Capacitor 1372:Φ 1337:Φ 1302:Inductors 1218:ε 1138:ε 1099:ε 1045:capacitor 1017:polarised 1015:, can be 1008:resistive 870:conductor 837:lab frame 518:θ 515:⁡ 182:electrons 166:chemistry 39:magnetism 3666:Category 3630:M-theory 3582:genetics 3369:21447877 2947:Archived 2893:21447877 2763:21447877 2604:21447877 2251:See also 1531:Inductor 1417:Resistor 1308:inductor 973:fermions 927:The net 894:aluminum 694:solenoid 356:are the 220:and the 3608:entropy 3596:Physics 3587:viruses 3570:Biology 3492:Pearson 2923:Bibcode 1436:Battery 1156:is the 1021:dipoles 955:photons 708:voltage 338:is the 214:gravity 184:around 109:of the 3508:  3498:  3402:  3392:  3367:  3357:  3166:  3156:  3095:  3085:  3009:  2999:  2941:  2891:  2881:  2761:  2751:  2688:  2678:  2602:  2592:  2553:  2543:  2453:  2443:  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Index

electromagnetism
fundamental forces
electricity
magnetism
Hans Christian Ørsted
electric currents
Michael Faraday
induce
James Clerk Maxwell
electromagnetism
Maxwell's equations
electromagnetic waves
Heinrich Hertz
radio
light
optics
Radio waves
wavelength
Albert Einstein
magnetic field
relativistic motion
electric field
quantum field
quantum electrodynamics
electrical engineering
Classical physics
macroscopic
atomic scale
Electrostatics
electric charges

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