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Electromagnetic Field Theory

Electromagnetic Field Theory
The attenuation in waveguide above to cut off frequency

Very low
Zero
Infinite
Very high

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Electromagnetic Field Theory
A wire 1 m long carries a current of 5A and is at an angle of 30o with B = 1.5 wb/m2. Magnitude of force is

 2 N.
 2.5 N.
 3.75 N.
 5 N.

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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?

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

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

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

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

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Electromagnetic Field Theory
Tropospheric scatter is used with frequencies in the

UHF
VLF
VHF
HF

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