Electromagnetic Field Theory
For a linear electromagnetic circuit, which of the following statement is true?

 Co-energy is zero.
 Field energy is equal to the co-energy.
 Field energy is lesser than the co-energy.
 Field energy is greater than the co-energy.

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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

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

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