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Electromagnetic Field Theory

Electromagnetic Field Theory
A square corner reflector is used in which of the following?

Point-to-point communication
TV broadcast
Radio astronomy
All of these

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Electromagnetic Field Theory
1 Maxwell is the same as

 104 weber.
 10-8 weber.
 10-4 weber.
 10-8 weber.

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Electromagnetic Field Theory
The electrical field strength at a distance point A due to a point charge +q, located at the origin, is 100 µl v/m. If the point charge is now enclosed by a perfectly conducting metal sheet sphere whose centre is at origin, A, outside the sphere, becomes

 100 μ v/m.
 None of above.
 0.
 - 100 μ v/m.

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Electromagnetic Field Theory
________ at a point is defined as the force experienced per unit positive charge at a point placed in the electric field.

 Electric flux.
 Magnetic flux density.
None of these
 Electric intensity.

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Electromagnetic Field Theory
In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as

Transmission efficiency
Loss coefficient
Front to back ratio
None of these

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Electromagnetic Field Theory
Skin depth is proportional to

 1/√σ.
 Permeability.
 Frequency.
 √(σ).

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