Electromagnetic Field Theory
Cork Screw rule is used to find

 direction of magnetic field.
 direction of current.
 direction of electric field.
 direction of emf.

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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

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

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