A copper disc of radius 0.1 m is roated ...

A copper disc of radius 0.1 m is roated about its centre with 20 revolutions per second in a uniform magnetic field of 0.1 T with its plane perpendicular the field. The emf induced across the radius of disc is

`pi/20` volt

`pi/10` volt

`20 pi` millivolt

`100 pi` millivolt

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