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Electromagnetic Field Theory

Electromagnetic Field Theory
A magnetic vector potential is given by the expression A = (- cos x) (cos y) uz. The flux density at the origin is

 – uy.
 – 2 ux.
  0.
 2 ux.

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Electromagnetic Field Theory
Magnetic field intensity at centre of circular coil, of diameter 1 m and carrying a current of 2 A is

 4 A/m.
 1 A/m.
 8 A/m.
 2 A/m.

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Electromagnetic Field Theory
For DC voltage an inductor is virtually a

 depends on polarity.
 open circuit.
 short circuit.
 depends on magnitude of voltage.

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Electromagnetic Field Theory
What is the unit of magnetic charge

  Ampere meter.
 Ampere.
 Coulomb.
 Ampere-meter square.

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Electromagnetic Field Theory
Which of the following will increase the antenna radiation efficiency?

Top loading of antenna
Providing insulation on conductor
Any of the above
Use of larger section of conductor

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Electromagnetic Field Theory
If the resistance of a conductor does not vary in accordance with the Ohms law it is known as

 reverse conductor.
 non - conductor.
 bad conductor.
 non - linear conductor.

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