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Electromagnetic Field Theory

Electromagnetic Field Theory
A Yagi antenna has a driven antenna

With one or more directors
With a reflector and one or more directors
Only
With a reflector

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

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Electromagnetic Field Theory
Biot-Savarts law states the relation between magnetic intensity and

 (A), (B), and (D) are all correct.
 filament current only.
 surface current only.
 volume current only.

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Electromagnetic Field Theory
A loop antenna is a commonly used for

All of these
Direction finding
Radar
Satellite communication

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Electromagnetic Field Theory
RF inductor are characterized by

 high current rating and high resistance.
 low current rating and low resistance.
 high current rating and low resistance.
 low current rating and high resistance.

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Electromagnetic Field Theory
A satellite that simply reflect back the signals from one region of the earth to the other region is known as

Active satellite
Orbiting satellite
Geostationary satellite
Passive satellite

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