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Electromagnetic Field Theory

Electromagnetic Field Theory
The force required to seperate two surfaces with a contact area measuring 5 cm by 6 cm, when flux density normal to the surface is 0.8 tesla, will be

 76.4 N.
 76400 N.
 764 N.
 7640 N.

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Electromagnetic Field Theory
MUF is depend upon

11 year sun spot cycle
Received frequency by receiver
Height of ionospheric layer
Electron density of the ionospheric layer

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Electromagnetic Field Theory
An insulated metal sphere of 20 cm diameter is charged by rubbing with charges 2 × 10-8 C. Potential developed will be

 1800 V.
 900 V.
 0 V.
 200 V.

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Electromagnetic Field Theory
Which of the following is multiband HF receiving antenna?

Conical horn
Folded dipole
Square loop
Log-periodic

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Electromagnetic Field Theory
The two windings of a transformer have an inductor of 2 H each. If mutual inductor between them is also 2 H, then

 turns ratio of the transformer is also two.
 none of these.
 it is a perfect transformer.
 transformer is an ideal transformer.

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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

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

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MORE MCQ ON Electromagnetic Field Theory

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