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Electromagnetic Field Theory

Electromagnetic Field Theory
For an inductor, current is proportional to

 voltage across the inductor.
 none of them.
 magnetic field.
 both (A) and (B).

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Electromagnetic Field Theory
Magnetic flux density emerging out of a closed surface is

 zero.
 depends on magnetic movements outside the closed surface
 infinite.
 depends on magnetic movements inside the closed surface.

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Electromagnetic Field Theory
The radiation pattern of Hertzian dipole in the plane perpendicular to dipole is a

Circle
Null
Figure of eight
None of these

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Electromagnetic Field Theory
The energy stored in the magnetic field at a solenoid 30 cm long and 3 cm diameter wound with 1000 turns of wire carrying an current at 10 A, is

 1.15 J.
 0.15 J.
 0.015 J.
 0.5 J.

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Electromagnetic Field Theory
In order to minimize loss due to hysteresis the magnetic material should have

 high hysteresis coefficient.
 large coercivity.
 high resistivity.
 small B-H loop area.

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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

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

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MORE MCQ ON Electromagnetic Field Theory

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