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Electromagnetic Field Theory

Electromagnetic Field Theory
A loop antenna is a commonly used for

Satellite communication
All of these
Direction finding
Radar

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Electromagnetic Field Theory
Which is the major factor for determining whether a medium is free space, lossless dielectric or a good conductor

 Attenuation constant.
 Constitutive parameters.
 Reflector coefficient.
  Loss tangent.

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Electromagnetic Field Theory
MUF is highest in periods of greatest sunspot activity.

True
False

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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

 12t3.
 24t.
 12t.
 4t3.

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Electromagnetic Field Theory
Two coupled coils with L1 = L2 = 0.6 H have a coupling coefficient of K = 0.8. The turns ratio N1/N2 is

 0.5.
 1.
 4.
 2.

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Electromagnetic Field Theory
A magnetic field B = 5 × 10-2 uz T exerts a force on 0.02 m conductor along the x-axis. The conductor carried a current of 5 mA in the – ux direction. What force must be applied to the conductor to hold it in position

 5 × 10-5 ux N.
  - 5 × 10-5 uy N.
 5 × 10-5 uy N.
 5 × 10-5 uz N.

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