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Electromagnetic Field Theory

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

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

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Electromagnetic Field Theory
If E is the electric field intensity, then what is the value of divergence of (curl of E)?

 Zero.
 E.
 | E |.
 Null vector.

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Electromagnetic Field Theory
Materials subjected to rapid reversals of magnetism should have

 both a and b.
 low hysteresis loss.
 high permeability.
 low permeability.

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

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

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Electromagnetic Field Theory
If n is the polarization vector and k is the direction of propagation plane electromagnetic wave, then

 n. k = 0.
 n = - k.
 n = K.
 n × k = 0.

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Electromagnetic Field Theory
The critical frequency of ‘F’ layer is greater than 30 MHz.

False
True

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