A uniform disc of radius R having charge Q distributed

Last updated: 6/10/2023

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 kx t where k is a constant r is the distance in metre from the centre of the disc and r is the time in second is switched on perpendicular to the plane of the disc Find the torque in N m acting on the disc after 15 sec Take 4kQ 1 S I unit and R 1m