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Electromagnetic Field Theory

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

False
True

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Electromagnetic Field Theory
A loop is rotating about x-axis in a magnetic field, B = BO cos(ω + φ) ay. The voltage in the loop is

 Zero.
 Due to both rotating and transformer action.
 Due to rotating only.
 Due to transformer only.

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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.
 0.5 J.
 0.15 J.
 0.015 J.

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Electromagnetic Field Theory
A voltage waveform V(t) = 12t2 is applied across a 1H inductor for t = 0, with initial current through it being zero. The current through the inductor for t = 0 is given by

 12t.
 12t3.
 24t.
 4t3.

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Electromagnetic Field Theory
If the static magnetic flux density is B, then

 Curl of B = 0.
  Divergence of B = 0.
 Divergence of B = J.
 Curl of B = J.

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Electromagnetic Field Theory
MUF is depend upon

Electron density of the ionospheric layer
Height of ionospheric layer
11 year sun spot cycle
Received frequency by receiver

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