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A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is:

1. twice per revolution
2. four times per revolution
3. six times per revolution
4. once per revolution

Correct answer: twice per revolution

Solution

The induced e.m.f. in a rotating wire loop changes direction every half revolution due to the reversal of the magnetic flux linkage. Therefore, the direction of the e.m.f. changes twice per revolution.

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