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Electromagnetic Field Theory

Electromagnetic Field Theory
In a lossless medium the intrinsic impedance η = 60π and μr = 1. The relative dielectric constant εr shall be

 4.
 1.
 2.
 8.

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Electromagnetic Field Theory
Which of this statement is not characteristic of a static magnetic field

 magnetic flux lines are always closed.
 it is conservative.
 it is solenoidal.
 it has no sink or sources.

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Electromagnetic Field Theory
The divergence of a vector is a scalar, while the curl of a vector is another

None of these
Vector
Unit vector
Scalar

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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 / π.
 ω/2π.
 ω/4π.
 ω.

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Electromagnetic Field Theory
Ohm’s law in point from field theory can be expressed as

 R = ρ × ( l / A).
 V = IR.
 J = σE.
 J = E / σ.

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Electromagnetic Field Theory
The radiation pattern of loop antenna is

Cardoid or Limacon
Circle
Elliptical
Semicircle

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