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Electromagnetic Field Theory

Electromagnetic Field Theory
Which antenna is a wideband antenna?

Marconi antenna
Hertz antenna
Folded dipole
None of these

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Electromagnetic Field Theory
A coil of 300 turns is wound on a non magnetic core having a mean circumference of 300 mm and a cross sectional area of 300 mm2. The inductance of the coil corresponding to a magnetizing current of 6 A will be

 37.68 μH.
 3.768 μH.
  113.04 μH.
 1.1304 μH.

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Electromagnetic Field Theory
The magnetic intensity in A/m at the centre of circular coil of diameter 1m and carrying a current of 2A is

 4.
 2.
 8.
 3.

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Electromagnetic Field Theory
A waveguide operated below cut off frequency can be used as

Phase shifter
None
An isolator
An attenuator

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Electromagnetic Field Theory
Materials subjected to rapid reversals of magnetism should have

 low hysteresis loss.
 high permeability.
 low permeability.
 both a and b.

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

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