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Electromagnetic Field Theory

Electromagnetic Field Theory
An open wire transmission line having a characteristic impedance of 600 ohms is terminated by a resistive load of 900 O. The standing wave ratio will be

4.5
1.5
3.5
2.5

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

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

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Electromagnetic Field Theory
The power gain of a half-wave dipole with respect to an isotropic radiator is

6 db
2.15 db
4.15 db
3 db

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Electromagnetic Field Theory
Which is the major factor for determining whether a medium is free space, lossless dielectric or a good conductor

 Reflector coefficient.
  Loss tangent.
 Attenuation constant.
 Constitutive parameters.

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

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Electromagnetic Field Theory
Voltage applied across a dielectric produces an electrostatic field 50 times greater than air. The dielectric constant of the dielectric will be

 20.
 50.
 5.
 10.

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