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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-

A

`(pi)/(20)` volt

B

`(pi)/(10)` volt

C

`20pi` millivolt

D

`100pi` millivolt

Text Solution

Verified by Experts

The correct Answer is:
C
`epsilon=(B omega R^(2))/(2)`
`=(0.1 xx (2pi xx 20)( 0.1)^(2))/(2)`
`=20pi xx 10^(-3)` volt
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