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Electromagnetic Field Theory

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
A negative point charge q = - 40 nC is moving with velocity of 6 × 106 m/s in a direction specited by unit vector uy + 0.6 uz. Find the magnitude of force vector on the moving particle by the field B = 2 ux + 3 uy + 5 uz mT and E = 2 ux - 3 uy + 5 uz KV/m

 144 μN.
 244 μN.
 1440 μN.
  1144 μN.

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Electromagnetic Field Theory
Two straight parallel conductors carry equal currents in opposite direction. The force between them is

 zero.
 none of above.
 repulsive.
 attractive.

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Electromagnetic Field Theory
A plane wave magnetic field is represented by Bx = cos(y – ct). The electric and magnetic fields will be zero in the direction

 None of these.
 Ey = Ez = 0, By = Bz = 0.
 Ex = Ey = 0, By = Bz = 0.
 Ex = Ey = 0, Bx = By = 0.

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Electromagnetic Field Theory
When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon

The direction of the conductor
The value of current
The weight of the conductor
None of these

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Electromagnetic Field Theory
A satellite that simply reflect back the signals from one region of the earth to the other region is known as

Passive satellite
Geostationary satellite
Active satellite
Orbiting satellite

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