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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.
 electrons.
 protons.
 neutrons.

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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

 150.
 600.
 450.
 300.

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Electromagnetic Field Theory
Which antenna is a wideband antenna?

Hertz antenna
Marconi antenna
None of these
Folded dipole

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Electromagnetic Field Theory
Two coils have inductances L1 = 1200 mH and L2 = 800 mH. They are connected in such a way that flux in the two coils aid each other and inductance is measured to be 2500 mH, then Mutual inductance between the coils is ___________ mH.

 225.
 250.
 150.
 145.

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Electromagnetic Field Theory
The frequency range for satellite communication is

300 to 3000 kHz
3000 to 30000 MHz
3 to 30 kHz
30000 to 300000 MHz

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Electromagnetic Field Theory
The critical frequency of ‘F’ layer is greater than 30 MHz.

True
False

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