Electromagnetic Field Theory
A circular loop has its radius increasing at a rate of 2 m/s. The loop placed perpendicular to a constant magnetic field of 0.5 wb/m2. When the radius of the loop is 4 m. the emf induced in the will be

 0.4 π V.
 0.8 π V.
 8 π V.
 Zero.

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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

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

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

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