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Electromagnetic Field Theory

Electromagnetic Field Theory
In above question no. 9, the average force on the core to reduce the air gap will be

 3332.47 N.
 1666.22 N.
 6664.8 N.
 832.29 N.

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Electromagnetic Field Theory
Which antenna is a wideband antenna?

Hertz antenna
Marconi antenna
Folded dipole
None of these

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Electromagnetic Field Theory
A square corner reflector is used in

Radio astronomy
All of these
Tv broadcast
Point to point communication

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Electromagnetic Field Theory
The divergence of a vector is a scalar, while the curl of a vector is another

Unit vector
Vector
Scalar
None of these

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Electromagnetic Field Theory
An electric dipole of moment P is placed in front of a ground sphere. The change induced on the surface of the sphere is (Assume radius of sphere = R and distance from dipole to centre of sphere = d)

 Zero.
 PR 2/d3.
 PR/d.
 PR/d2.

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Electromagnetic Field Theory
Two infinite parallel metal plates are charged with equal surface charge density of the same polarity. The electric field in the gap between the plates is

 same as that produced by one plate.
 zero.
 dependent on coordinates of field points.
 double the field produced by one plate.

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