Electromagnetic Field Theory
If an electric current carrying coil is placed in a uniform magnetic field in the direction of magnetic induction, then

 the net force and torque are both finite.
 the net force is finite but torque is zero.
 the net force and torque on the coil are both zero.
 the net force is zero but torque is finite.

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

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

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