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Electromagnetic Field Theory

Electromagnetic Field Theory
The main purpose of choke is

 to pass high frequencies.
 to block low frequencies.
  to pass low frequencies.
 none of above.

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Electromagnetic Field Theory
The hysteresis loop of a magnetic material has an area of 5 cm2 with the scale given as 1 cm = 2 AT and 1 cm = 50 mwb At 50 Hz; the total hysteresis loss is

  25 W.
 50 W.
 20 W.
 15 W.

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Electromagnetic Field Theory
XEROX machine is working on

 heating effect of current.
 electrostatic effect.
 magnetic effect.
 peltier effect.

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Electromagnetic Field Theory
A vector field A = p In is given in Cartesian coordinates. In cylindrical coordinates it will be represented as

 A = cosφ Ir + sinφ Iφ.
 A = cosφ Ir - sinφ Ir.
 A = sinφ Ir.
 A = cosφ Ir.

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Electromagnetic Field Theory
If the static magnetic flux density is B, then

 Curl of B = J.
  Divergence of B = 0.
 Curl of B = 0.
 Divergence of B = J.

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Electromagnetic Field Theory
A wire 1 m long carries a current of 5A and is at an angle of 30o with B = 1.5 wb/m2. Magnitude of force is

 3.75 N.
 2 N.
 2.5 N.
 5 N.

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