First slide

Lenz's law and conservation of energy

Question

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

Easy

A

four times per revolution
B

six times per revolution
C

once per revolution
D

twice per revolution

Solution

when the disc is rotating if first one fourth of rotation flux increases then next next one fourth of rotation flux decreases and so on.

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