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

1. 50 ampere DC
2. 50 ampere 50 Hz AC
3. 50 ampere 500 нz
4. 100 ampere DC

Correct answer: 50 ampere 500 нz

Solution

Induced e.m.f. is proportional to the rate of change of current, so a higher frequency produces a larger induced e.m.f. than a lower frequency for the same current. Among the choices, the 500 Hz AC changes most rapidly, so it gives the maximum induced e.m.f.

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