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30 A uniform disc of radius R having charge Q distributed uniformly all over its...

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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

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