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Electromagnetic Field Theory

Electromagnetic Field Theory
In a lossless medium the intrinsic impedance η = 60π and μr = 1. The relative dielectric constant εr shall be

 4.
 2.
 8.
 1.

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Electromagnetic Field Theory
In frec space E (z,t) = 103 sin(ωt - βz) uy v/m. What is the value of H (z,t)

 (103/377) cos(ωt - β z)(-ux) A/m.
 None of above.
 (103/377) sin(ωt - β z)(-uy) A/m.
  (103/377) sin(ωt - β z)(-ux) A/m.

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Electromagnetic Field Theory
Find H for centre of solenoid having finite length d = 1 unit where N = no of turns = 500, I = 2 A.

 100.
 1000.
 500.
 None of these.

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Electromagnetic Field Theory
In case of surface waves the field strength at a point is directly proportional to

Current of the antenna
Wave frequency
Antenna height
Distance of the point from the antenna

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

 cooling.
 short time rating.
 overload capacity.
 rating.

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

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

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