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Electromagnetic Field Theory

Electromagnetic Field Theory
The electric flux is given D = (2y2 + z) Ix + 4xy Iy + x Iz C/m2. The volume charge density at point (-1, 0, 3) is

 - 2 C/m3.
 - 8 C/m3.
 - 4 C/m3.
 0 C/m3.

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Electromagnetic Field Theory
A square corner reflector is used in which of the following?

Radio astronomy
All of these
Point-to-point communication
TV broadcast

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

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

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Electromagnetic Field Theory
A sphere of radius with a uniform charge density ρv C/m3 shall have electric flux density at radius “r = a” equal to

 ρv/3 C/m2.
 aρv/3 C/m2.
 aρv/4 C/m2.
 aρv C/m2.

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

Balun
Tee
Directional Coupler
Slotted line

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Electromagnetic Field Theory
A satellite that simply reflect back the signals from one region of the earth to the other region is known as

Passive satellite
Geostationary satellite
Active satellite
Orbiting satellite

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