Electromagnetic Field Theory
A coil of 300 turns is wound on a non-magnetic core having a mean circumference of 300 mm and a cross sectional area of 300 mm2. The current of 3 A will be

 37.68 mH.
 113.04 µH.
 37.68 µH.
 113.04 mH.

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

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