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Electromagnetic Field Theory

Electromagnetic Field Theory
If the static magnetic flux density is B, then

 Curl of B = 0.
 Curl of B = J.
 Divergence of B = J.
  Divergence of B = 0.

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Electromagnetic Field Theory
Two coils are coupled in such a way that the mutual inductance between them is 20 mH. If the inductances of the coils are 40 mH and 50 mH respectively, the coefficient of coupling is

 0.447.
 0.577.
 0.01.
 0.477.

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Electromagnetic Field Theory
A medium is said to be isotropic when

 ∈ is a scalar constant.
 ∈ = μσ.
 ∈ is zero.
 ∈ = μ.

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Electromagnetic Field Theory
MUF is depend upon

Height of ionospheric layer
Received frequency by receiver
Electron density of the ionospheric layer
11 year sun spot cycle

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Electromagnetic Field Theory
A potential field is given by V = 3x2 y – yz. The electric field at P(2, -1, 4) is

 12 Ix - Iz V/m.
 12 Ix - 8 Iy - Iz V/m.
 12 Ix - 8 Iy V/m.
 12 Ix + 8 Iy + Iz V/m.

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Electromagnetic Field Theory
The transmitting antennas for lower frequencies (below 500 kHz) are generally

Vertical grounded wire type
Any of the above
Horizontal suspended wire type
Parabolic reflector type

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MORE MCQ ON Electromagnetic Field Theory

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