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In an electric motor, the electric current and magnetic field exist (which are the causes), and they lead to the force that creates the motion (which is the effect), and so the left-hand rule is used. In an electric generator, the motion and magnetic field exist (causes), and they lead to the
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To illustrate why, consider that many types of electric motors can also be used as electric generators. A vehicle powered by such a motor can be accelerated up to high speed by connecting the motor to a fully charged
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The bolded letters in the directions above give a mnemonic way to remember the order. Another mnemonic for remembering the rule is the initialism "FBI", standing for
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the symbol for current. The subsequent letters correspond to subsequent fingers, counting from the top: thumb → F; first finger → B; second finger → I.
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Different hands need to be used for motors and generators because of the differences between cause and effect.
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When a conductor such as a wire attached to a circuit moves through a magnetic field, an
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mutually perpendicular to each other (at right angles), as shown in the diagram.
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creation of the electric current (effect), and so the right-hand rule is used.
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An equivalent version of
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ield. By convention, it's the direction from North to South magnetic pole.
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Mnemonic for the direction of induced current in a moving magnetic field
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to the terminal with higher electric potential, as in a voltage source)
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urrent within the conductor (from + to −, the terminal with lower
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ond finger represents the direction of the induced or generated
258:(12th ed.). Pearson Education Limited. p. 145.
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irst finger is pointed in the direction of the magnetic
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otion of the conductor relative to the magnetic field.
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Distinction between the right-hand and left-hand rule
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294:Diagrams at magnet.fsu.edu
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