Electromagnetic Field Theory
An electric dipole of moment P is placed in front of a ground sphere. The change induced on the surface of the sphere is (Assume radius of sphere = R and distance from dipole to centre of sphere = d)

 PR 2/d3.
 Zero.
 PR/d.
 PR/d2.

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

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