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Electromagnetic Field Theory

Electromagnetic Field Theory
A square corner reflector is used in

Radio astronomy
Tv broadcast
All of these
Point to point communication

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

 0.15 J.
 1.15 J.
 0.5 J.
 0.015 J.

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Electromagnetic Field Theory
The magnetic field required to reduce the residual magnetism to zero is called

 Coercivity.
 Retentivity.
 Hysteresis.
 Saturation magnetism.

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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/4 C/m2.
 aρv C/m2.
 aρv/3 C/m2.

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Electromagnetic Field Theory
If the resistance of a conductor does not vary in accordance with the Ohms law it is known as

 non - linear conductor.
 non - conductor.
 reverse conductor.
 bad conductor.

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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

 50 V.
 25 V.
 75 V.
 100 V.

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MORE MCQ ON Electromagnetic Field Theory

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