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Electromagnetic Field Theory

Electromagnetic Field Theory
The force required to seperate two surfaces with a contact area measuring 5 cm by 6 cm, when flux density normal to the surface is 0.8 tesla, will be

 76.4 N.
 76400 N.
 764 N.
 7640 N.

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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.

 0.88 mm.
  1.77 mm.
 0.
 1.32 mm.

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

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

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Electromagnetic Field Theory
The magnitude of the induced emf in a conductor depends upon on the

 rate of change of flux linkage.
 amount of flux cut.
 flux density of the magnetic field.
 amount of flux linkage.

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Electromagnetic Field Theory
What is the unit of magnetic charge

 Ampere.
 Coulomb.
  Ampere meter.
 Ampere-meter square.

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Electromagnetic Field Theory
A magnetic vector potential is given by the expression A = (- cos x) (cos y) uz. The flux density at the origin is

  0.
 2 ux.
 – 2 ux.
 – uy.

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