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Electromagnetic Field Theory

Electromagnetic Field Theory
The ability of charged bodies to exert force on one another is attributed to the existence of

 electric field.
 protons.
 electrons.
 neutrons.

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Electromagnetic Field Theory
A magnetic circuit requires 800 AT to produce a certain quantity of flux in a magnetic circuit. If its excitation coil has 100 turns and 5 Ohm resistance, the voltage to be applied in exciting coil is

 8 V.
 40 V.
 60 V.
 80 V.

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Electromagnetic Field Theory
The skip distance is the maximum distance upto which ionospheric reflection is possible.

False
True

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Electromagnetic Field Theory
Magnetic circuit with cross sectional area of 20 cm2 is to be operated at 50 Hz from 120 Vrms supply. The number of turns required to active a peak magnetic flux density of 1.8 T in the core flux is

 300.
 450.
 600.
 150.

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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

None of these
Loss coefficient
Front to back ratio
Transmission efficiency

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Electromagnetic Field Theory
Two infinite parallel metal plates are charged with equal surface charge density of the same polarity. The electric field in the gap between the plates is

 same as that produced by one plate.
 dependent on coordinates of field points.
 zero.
 double the field produced by one plate.

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