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Electromagnetic Field Theory

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

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

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Electromagnetic Field Theory
A square corner reflector is used in which of the following?

Radio astronomy
All of these
TV broadcast
Point-to-point communication

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Electromagnetic Field Theory
A conductor is rotating with in a magnetic field. At which of the positions do the peak voltages occur?

 Along the axis of the magnetic field.
 Anywhere.
 At an angle of 45° to the axis of the magnetic field.
 At right angles to the axis of the magnetic field.

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Electromagnetic Field Theory
What is the value of skin depth as 100 Hz in a material having μr = 1.0 and & σ = 3.60 × 107 s/m

 2.4 mm.
 8.4 mm.
 4 mm.
 10 mm.

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Electromagnetic Field Theory
The tubes of force within the magnetic material are known as

 none of them.
 lines of force.
 magnetic flux.
 tubes of indication.

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Electromagnetic Field Theory
Which of the following is multiband HF receiving antenna?

Folded dipole
Log-periodic
Conical horn
Square loop

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