Electromagnetic Field Theory
A copper disc is rotated rapidly below a freely suspended magnetic needle. The magnetic needle starts rotating with velocity

 less than that of disc but in opposite direction.
 equal to that of disc and in the same direction.
 equal to that of disc and in the opposite direction.
 less than that of disc and in the same direction.

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Electromagnetic Field Theory
Two spheres of radius r1 and r2 are connected by a conducting wire. Each of the spheres has been given a charge Q. Now

 larger sphere will have smalled potential.
 larger sphere will have greater potential.
 smaller sphere will have zero potential.
 both of sphere will have same potential.

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