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

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

`(pi)/(20)V`

`(pi)/(10)V`

`20pimV`

`100pi mV`

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