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A line charge negligible mass with linear charge density A is wound around the circumference...

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A line charge negligible mass with linear charge density A is wound around the circumference of an insulating uniform disc of mass M and radius R It is placed in uniform magnetic field Bo directed along its axis Initially it is held just above the rough ground and is free to rotate about its central axis Suddenly the field is switched off which causes the disc to rotate Now the disc is placed gently over rough horizontal surface If final angular 2 B R speed of disc is nM O 7 find the value of n Rough surface

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