A uniform disc of radius R having charge Q distributed uniformly all over its surface is placed on a smooth horizontal surface. A magnetic field B = Kxt 2 , where K = constant, x is the distance (in meter) from the center of the disc and t is the time (in second) is switched on perpendicular to the plane of the disc. The torque (in N - m) acting on the disc after 15 sec. (Take 2 KQ = 1 S.I. unit and R = 1 meter) in N - m is –
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(3)
Sol. Consider a ring of thickness dx
Torque on this ring 
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