Electromagnetic Field Theory
Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike?

None of these
Rain drops may not collect
Dust particles may not accumulate
Charge per unit area becomes very high for lightening to discharge

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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

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

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