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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.

 1.32 mm.
  1.77 mm.
 0.
 0.88 mm.

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Electromagnetic Field Theory
The work done by a force F = 4un - 3uy + 2uz N in giving a 1nC charge a displacement of (10 ux + 2uy - 7uz) m is

 100 nj.
 60 nj.
 20 nj.
 40 nj.

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Electromagnetic Field Theory
Magnetic circuit with cross sectional area of 20 cm2 is to be operated at 50 Hz from 120 Vrms supply. The number of turns required to active a peak magnetic flux density of 1.8 T in the core flux is

 450.
 150.
 600.
 300.

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

Unity
None of these
Both A and B
Constant

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

None of these
Vector
Scalar
Unit vector

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Electromagnetic Field Theory
A point pole has a strength of 4π × 10-4 weber. The force in newtons on a point pole of 4π × 1.5 × 10-4 weber placed at a distance of 10 cm from it will be

 15 N.
 20 N.
 3.75 N.
 7.5 N.

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