Electromagnetic Field Theory
A metal surface with 1 meter radius and surface charge density of 20 coulombs / m2 is enclosed in a 10 m side cube. The total outward electric displacement normal to the surface of the cube is

 40π coulombs.
 80π coulombs.
 none of these.
 10π coulombs.

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

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