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Electromagnetic Field Theory

Electromagnetic Field Theory
An infinite non conducting sheet of charge has σ of 10-7 c/m3. Equipotential surface for a potential of 10 volts is.

 0.
 1.32 mm.
  1.77 mm.
 0.88 mm.

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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)

 PR/d2.
 PR 2/d3.
 Zero.
 PR/d.

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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

2.5
4.5
1.5
3.5

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Electromagnetic Field Theory
For DC voltage an inductor is virtually a

 open circuit.
 depends on magnitude of voltage.
 short circuit.
 depends on polarity.

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

4.15 db
2.15 db
6 db
3 db

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Electromagnetic Field Theory
The magnetic intensity in A/m at the centre of circular coil of diameter 1m and carrying a current of 2A is

 3.
 4.
 8.
 2.

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