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)`vilt

`20pi` millivolt

`2pi` mV

`20pi mu V`

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