Electromagnetic Field Theory
An inductor designed with 400 turns coil wound on an iron core of 16 cm2 cross sectional area and with a cut of air gap length of 1 mm. The coil is connected to a 230 V, 50 Hz supply. Neglected coil resistance, core loss, iron reluctance and leakage inductance. Find the current in the inductor.

 9.04 A.
 4.56 A.
 2.28 A.
 18.08 A.

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Electromagnetic Field Theory
Two spheres of radius r1 and r2 are connected by a conducting wire. Each of the spheres has been given a charge Q. Now

 larger sphere will have greater potential.
 larger sphere will have smalled potential.
 both of sphere will have same potential.
 smaller sphere will have zero potential.

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