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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

 2.4 mm.
 4 mm.
 8.4 mm.
 10 mm.

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Electromagnetic Field Theory
The main purpose of choke is

 to block low frequencies.
 none of above.
  to pass low frequencies.
 to pass high frequencies.

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Electromagnetic Field Theory
Two infinite parallel metal plates are charged with equal surface charge density of the same polarity. The electric field in the gap between the plates is

 zero.
 dependent on coordinates of field points.
 same as that produced by one plate.
 double the field produced by one plate.

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Electromagnetic Field Theory
The potential that appears at a point in space due to the current which caused it is called potential

Accelerating
Lagging the current
Retardation
Oscillating

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Electromagnetic Field Theory
A voltage waveform V(t) = 12t2 is applied across a 1H inductor for t = 0, with initial current through it being zero. The current through the inductor for t = 0 is given by

 4t3.
 12t.
 12t3.
 24t.

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Electromagnetic Field Theory
Unit of electric flux density is

 coulomb / meter2.
 coulomb.
 weber / meter2.
 farad / meter.

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