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Electromagnetic Field Theory

Electromagnetic Field Theory
If a and b are the dimensions of waveguide then

a = 3b
a = b/4
a = 2b
a = b

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Electromagnetic Field Theory
Electric field strength of charge

 Increase distance.
 Decrease with distance.
 Increase square distance.
 Decrease with square distance.

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Electromagnetic Field Theory
The transmitting antennas for lower frequencies (below 500 kHz) are generally

Any of the above
Horizontal suspended wire type
Vertical grounded wire type
Parabolic reflector type

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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

Transmission efficiency
Front to back ratio
Loss coefficient
None of these

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Electromagnetic Field Theory
A wire 1 m long carries a current of 5A and is at an angle of 30o with B = 1.5 wb/m2. Magnitude of force is

 3.75 N.
 5 N.
 2 N.
 2.5 N.

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

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

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MORE MCQ ON Electromagnetic Field Theory

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