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Electromagnetic Field Theory

Electromagnetic Field Theory
The force required to seperate two surfaces with a contact area measuring 5 cm by 6 cm, when flux density normal to the surface is 0.8 tesla, will be

 76.4 N.
 7640 N.
 76400 N.
 764 N.

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Electromagnetic Field Theory
If a and b are the dimensions of waveguide then

a = b
a = b/4
a = 2b
a = 3b

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

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

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Electromagnetic Field Theory
A metal surface with 1 meter radius and surface charge density of 20 coulombs / m2 is enclosed in a 10 m side cube. The total outward electric displacement normal to the surface of the cube is

 80π coulombs.
 10π coulombs.
 none of these.
 40π coulombs.

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Electromagnetic Field Theory
For DC voltage an inductor is virtually a

 open circuit.
 depends on polarity.
 depends on magnitude of voltage.
 short circuit.

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Electromagnetic Field Theory
A conductor of length 1 metre moves at right angles to magnetic field of flux density 1 Wb/m2 with a velocity of 25 m/s. The induced emf in the conductor will be

 75 V.
 100 V.
 25 V.
 50 V.

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MORE MCQ ON Electromagnetic Field Theory

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