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Electromagnetic Field Theory

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

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

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Electromagnetic Field Theory
The Kirchhoff’s current law is implict in expression

  Surface integral of (j.ds) = 0.
 Divergence of B = 0.
 Divergence of D = ρv.
 Curl of H = J + (δ D)/(δ t).

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Electromagnetic Field Theory
Find the length of a conductor which is moving with a velocity 0.4m/s in a magnetic field of 8T, inducing an emf of 20V.

 6.25m.
 5.25m.
 0.5m.
 0.6m.

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Electromagnetic Field Theory
XEROX machine is working on

 electrostatic effect.
 peltier effect.
 magnetic effect.
 heating effect of current.

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Electromagnetic Field Theory
Which antenna is a wideband antenna?

Folded dipole
Marconi antenna
Hertz antenna
None of these

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Electromagnetic Field Theory
The heating time constant of an electrical machine gives an indication of its

 short time rating.
 overload capacity.
 cooling.
 rating.

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