30 A uniform disc of radius R having charge Q distributed

Last updated: 6/25/2023

30 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 Kxt2 where K constant x is the distance in metre from the centre 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 metre is N m