Electromagnetic Field Theory
Which of the following will increase the antenna radiation efficiency?

Any of the above
Providing insulation on conductor
Top loading of antenna
Use of larger section of conductor

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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 smalled potential.
 smaller sphere will have zero potential.
 larger sphere will have greater 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 exits between the conductor and the ground. The maximum electric stress occur at

 The ground surface.
 Midway between the conductor and ground.
 The lower surface of the conductor.
 The upper surface of the conductor.

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