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Question

A copper disc of radius 0.1 m rotates about its centre with 10 revolutions per second in a uniform magnetic field of 0.1 Tesla. The emf induced across the radius of the disc is


Solution

The correct option is C

The induced emf between centre and rim of the rotating disc is 

E=12BwR2=12× 0.1× 2π× 10× (0.1)2=10π× 103volt

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