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Electromagnetic Field Theory

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

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

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Electromagnetic Field Theory
Electric field strength of charge

 Increase distance.
 Decrease with square distance.
 Decrease with distance.
 Increase square distance.

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Electromagnetic Field Theory
A coil of 300 turns is wound on a non magnetic core having a mean circumference of 300 mm and a cross sectional area of 300 mm2. The inductance of the coil corresponding to a magnetizing current of 6 A will be

 1.1304 μH.
 3.768 μH.
 37.68 μH.
  113.04 μH.

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Electromagnetic Field Theory
The operation of electric generators and motors depend on the intraction between magnetic field and

 Electric fields.
  Electric current.
 Copper conductors.
 Commutator.

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Electromagnetic Field Theory
1 Tesla =

 1 wb- m2.
 1 wb .
 1 wb/ m2.
 1 wb/m.

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Electromagnetic Field Theory
An emf of 16 volts is induced in a coil of inductance 4 H. The rate of change of current must be

 16 A / s.
 4 A / s.
 32 A / s.
 64 A / s.

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