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Electromagnetic Field Theory

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

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

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Electromagnetic Field Theory
Which of the following is zero in relation to electromagnetic fields?

 Grad div A.
 Curl curl A.
 Div curl A.
 Div grad V.

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Electromagnetic Field Theory
Magnetic current is composed of which of the following?

 Both conduction and displacement current.
None of these
 Only conduction current.
 Only displacement current.

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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?

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

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Electromagnetic Field Theory
The virtual height of an ionospheric layer is __________ true height

Equal to
Higher than
No relation
Less than

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Electromagnetic Field Theory
What is the value of magnetic vector potential due to an infinitesimally small current element, evaluated at infinite distance from it?

 Zero.
 Depends on strength of current element.
 Unity.
 Infinity.

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