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 µH.
 37.68 mH.
 113.04 µH.
 113.04 mH.

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Electromagnetic Field Theory
Inside a hollow conducting sphere

 electric field is zero.
 electric field changes with magnitude of the charge given to the conductor.
 electric field changes with distance from the center of the sphere.
 electric field is a non zero constant.

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