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Electromagnetic Field Theory

Electromagnetic Field Theory
What is the value of skin depth as 100 Hz in a material having μr = 1.0 and & σ = 3.60 × 107 s/m

 4 mm.
 8.4 mm.
 10 mm.
 2.4 mm.

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Electromagnetic Field Theory
The heating time constant of an electrical machine gives an indication of its

 rating.
 cooling.
 overload capacity.
 short time rating.

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Electromagnetic Field Theory
In above problem, if the inductance L1 and L2 in series aiding with 30 mH mutual inductance, then total inductance will be

 150 mH.
 100 mH.
 200 mH.
 50 mH.

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Electromagnetic Field Theory
The frequency of the power wave associated with an electromagnetic wave having field as E = e-z/δ cos(ω - zδ) is given by

 ω/2π.
 ω / π.
 ω/4π.
 ω.

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

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

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

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

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