The induced electromotive force increases when a magnet is moved fast in a stationary coil of wire because

Magnetic field increases

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Rate of change of magnetic field increases

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Rate of change of magnetic field decreases

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Magnetic field decreases

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Solution

The correct option is A Rate of change of magnetic field increases
Electromotive force is induced in a coil when magnetic flux near the coil changes and it depends on the rate of change of magnetic field near the coil.
Hence emf will increase when rate of change of magnetic field increases.

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