Electromagnetic Field Theory
The wave in wave guide has

Larger frequency than in the free space
Diminishing wavelength than in the free space
Larger wavelength than in the free space
Group velocity inversely proportional to wavelength

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

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Electromagnetic Field Theory
A long wire composed of a smooth round conductor runs above and parallel to the ground (assumed to be a large conducting plane). A high voltage exists between the conductor and the ground. The maximum electric stress occurs at

 the ground surface.
 lower surface of the conductor.
 upper surface of the conductor.
 midway between the conductor and ground.

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