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.

 2.28 A.
 18.08 A.
 9.04 A.
 4.56 A.

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Electromagnetic Field Theory
The wave in wave guide has

Larger frequency than in the free space
Larger wavelength than in the free space
Diminishing wavelength than in the free space
Group velocity inversely proportional to wavelength

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