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An induced e.m.f. is produced when a magnet is plunged into a coil. The strength of the induced e.m.f. is independent of

1. the strength of the magnet
2. number of turns of coil
3. the resistivity of the wire of the coil
4. speed with which the magnet is moved

Correct answer: the resistivity of the wire of the coil

Solution

By Faraday’s law, induced e.m.f. depends on the rate of change of magnetic flux and the number of turns in the coil. The wire’s resistivity affects the current produced, but not the e.m.f. itself.

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