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Q.

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

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a

twice per revolution.

b

four times per revolution.

c

six times per revolution.

d

once per revolution.

answer is A.

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Detailed Solution

This is the case of periodic EMI:

Question Image

From graph, it is clear that direction is changing once in $\frac{1}{2}$ cycle.

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