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Faraday's Law

Which one of ...

Question

Which one of the following can produce maximum induced e.m.f.?

A

50 ampere DC

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B

50 ampere 50 Hz AC

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C

50 ampere 500 Hz

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D

100 ampere DC

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Solution

The correct option is C 50 ampere 500 Hz
Rate of change of magnetic field is proportional to the frequency of the alternating current. Moreover DC cannot produce emf as the current in not changing. Thus, maximum EMF is induced for highest frequency of AC, assuming that the coil doesn't move in all the cases.

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