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Electromagnetic Field Theory

Electromagnetic Field Theory
Self inductance of magnetic coil is proportional to

 N.
 N2.
 1 / N.
 1 / N2.

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Electromagnetic Field Theory
A satellite that simply reflect back the signals from one region of the earth to the other region is known as

Passive satellite
Active satellite
Orbiting satellite
Geostationary satellite

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Electromagnetic Field Theory
The lagging of flux density behind the applied magnetising force is known as

 flux.
 permeance.
All of these
 hysteresis.

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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.

 4.56 A.
 9.04 A.
 2.28 A.
 18.08 A.

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Electromagnetic Field Theory
The two windings of a transformer have an inductor of 2 H each. If mutual inductor between them is also 2 H, then

 it is a perfect transformer.
 none of these.
 turns ratio of the transformer is also two.
 transformer is an ideal transformer.

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Electromagnetic Field Theory
A Yagi antenna has a driven antenna

With one or more directors
With a reflector
Only
With a reflector and one or more directors

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