A copper disc of radius 0.1 m rotates ab...

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

`(pi)/(10)` volt

`(2 pi)/(10)` volt

`pixx10^(-2)` volt

`2 pi xx10^(-2)` volt

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