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Electromagnetic Field Theory

Electromagnetic Field Theory
The frequency range for satellite communication is

3 to 30 kHz
30000 to 300000 MHz
300 to 3000 kHz
3000 to 30000 MHz

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Electromagnetic Field Theory
A loop antenna is a commonly used for

Satellite communication
All of these
Radar
Direction finding

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Electromagnetic Field Theory
Two coils are coupled in such a way that the mutual inductance between them is 20 mH. If the inductances of the coils are 40 mH and 50 mH respectively, the coefficient of coupling is

 0.01.
 0.477.
 0.577.
 0.447.

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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 current of 3 A will be

 37.68 µH.
 37.68 mH.
 113.04 µH.
 113.04 mH.

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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

 200 V.
 0 V.
 900 V.
 1800 V.

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Electromagnetic Field Theory
How much current must flow in a loop of radius 1m to produce a magnetic field of 1 mA/m?

 2.5 mA.
 1mA.
 2 mA.
 1.5 mA.

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MORE MCQ ON Electromagnetic Field Theory

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