Question

What conditions would cause an emf in a coil kept near a bar magnet?

Answer 1

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The direction of the induced voltage is reversed when the magnet is moved out of the coil again. It can also be reversed if the other pole of the magnet is moved into the coil. If the coil is part of a complete circuit then a current will be induced in the circuit.

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Answer 2

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An emf is induced in the coil when a bar magnet is pushed in and out of it. Emfs of opposite signs are produced by motion in opposite directions, and the emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important.