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Electromagnetic Field Theory

Electromagnetic Field Theory
Which of the following is zero in relation to electromagnetic fields?

 Div grad V.
 Curl curl A.
 Div curl A.
 Grad div A.

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

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

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Electromagnetic Field Theory
A waveguide operated below cut off frequency can be used as

None
An attenuator
Phase shifter
An isolator

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Electromagnetic Field Theory
The ability of charged bodies to exert force on one another is attributed to the existence of

 electric field.
 electrons.
 protons.
 neutrons.

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Electromagnetic Field Theory
Coulombs law for the force between electric charges most closely resembles with

 Newtons law of motion.
 Law of conservation of energy.
 Gauss theorem.
 Newtons law of gravitation.

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Electromagnetic Field Theory
The magnitude of force acting on a current carrying conductor placed in a magnetic field is independent of

 cross-sectional area of conductor.
 length of conductor.
 current flowing through the conductor.
 flux density.

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