A copper disc of radius `1m` is rotated about its natural axis with an angular velocity `2 "rad"//"sec"` in a uniform magnetic field `5` telsa with its plane perpendicular to the field. Find the emf induced between the centre of the disc and its rim.

Explanation

`e = (1)/(2) B omega r^(2)`, `e = (1)/(2) xx 5 xx 2 xx 1 xx 1 = 5 "volt"`