The induced emf in the coil is given by Faraday's law of electromagnetic induction:
, where B is the magnetic field, l is length, and v is speed.
When a magnet is plunged into a coil at speed v, as shown in the figure, a voltage is induced in the coil and a current flows in the circuit.
If the speed of the magnet is doubled, the induced voltage is ________ .
a.) twice as great
b.) four times as great
c.) half as great
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