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Electromagnetic Field Theory

Electromagnetic Field Theory
When a conductor moves in the field, so that it makes an angle 8 with the lines of flux, the force F is given as : F = Bl sin2 0.

Yes
No

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Electromagnetic Field Theory
For a line characteristic impedance zo terminated is load zo/3, the reflection coefficient is

 2/3.
 – 1/3.
 1/3.
  – ½.

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Electromagnetic Field Theory
The useful magnetic flux obtainable from any closed surface is

None of these
Both A and B
Unity
Constant

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Electromagnetic Field Theory
The frequency range for satellite communication is

3 to 30 kHz
30000 to 300000 MHz
300 to 3000 kHz
3000 to 30000 MHz

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

3 db
4.15 db
2.15 db
6 db

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Electromagnetic Field Theory
The shape of B-H curve for air gap is

 ellipse.
 parabola.
 straight line.
 hyperbola.

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