1.

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)`voltB. `(pi)/(10)` voltC. `20 pi`millivoltD. `100 pi` millivolt

Answer» Correct Answer - C
`varepsilon =(BomegaR^(2))/(2)=(0.1xx(2pixx20)(0.1)^(2))/(2)`
`=20 pi xx 10^(-3)` volt


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