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Electromagnetic Field Theory

Electromagnetic Field Theory
For DC voltage an inductor is virtually a

 depends on polarity.
 open circuit.
 short circuit.
 depends on magnitude of voltage.

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Electromagnetic Field Theory
Ohm’s law in point from field theory can be expressed as

 J = E / σ.
 J = σE.
 V = IR.
 R = ρ × ( l / A).

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Electromagnetic Field Theory
Tropospheric scatter propagation is not subject to any fading.

False
True

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Electromagnetic Field Theory
In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as

Loss coefficient
None of these
Transmission efficiency
Front to back ratio

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Electromagnetic Field Theory
Self inductance of magnetic coil is proportional to

 1 / N2.
 N.
 N2.
 1 / N.

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Electromagnetic Field Theory
The magnetic vector potential due to a single conductor carrying current is

 infinite.
 zero.
 finite.
 none of tha above.

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