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Electromagnetic Field Theory

Electromagnetic Field Theory
If n is the polarization vector and k is the direction of propagation plane electromagnetic wave, then

 n = - k.
 n = K.
 n × k = 0.
 n. k = 0.

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Electromagnetic Field Theory
In case of surface waves the field strength at a point is directly proportional to

Antenna height
Distance of the point from the antenna
Current of the antenna
Wave frequency

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Electromagnetic Field Theory
The tubes of force within the magnetic material are known as

 magnetic flux.
 lines of force.
 tubes of indication.
 none of them.

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Electromagnetic Field Theory
The core of coil length is 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be

 24 mH.
 12 mH.
 48 mH.
 3 mH.

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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

 2 A/m.
 1 A/m.
 4 A/m.
 8 A/m.

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Electromagnetic Field Theory
In above question no. 9, the average force on the core to reduce the air gap will be

 832.29 N.
 6664.8 N.
 1666.22 N.
 3332.47 N.

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MORE MCQ ON Electromagnetic Field Theory

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