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Electromagnetic Field Theory

Electromagnetic Field Theory
Two straight parallel conductors carry equal currents in opposite direction. The force between them is

 zero.
 none of above.
 attractive.
 repulsive.

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

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

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Electromagnetic Field Theory
It is best to use for coupling a coaxial line to a parallel wire transmission line.

Slotted line
Balun
Directional Coupler
Tee

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Electromagnetic Field Theory
The power gain of a half-wave dipole with respect to an isotropic radiator is

4.15 db
2.15 db
3 db
6 db

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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.
 1666.22 N.
 6664.8 N.
 3332.47 N.

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Electromagnetic Field Theory
The energy stored in the magnetic field in a solenoid 30 cm long and 3 cm diameter wound with 1000 turns of wire carrying a current at 10 amp, is

 1.15 joule.
 0.015 joule.
 0.15 joule.
 0.015 joule.

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MORE MCQ ON Electromagnetic Field Theory

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