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Electromagnetic Field Theory

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

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

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Electromagnetic Field Theory
The tubes of force within the magnetic material are known as

 magnetic flux.
 none of them.
 lines of force.
 tubes of indication.

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Electromagnetic Field Theory
Materials subjected to rapid reversals of magnetism should have

 low permeability.
 low hysteresis loss.
 both a and b.
 high permeability.

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Electromagnetic Field Theory
An inductor designed with 400 turns coil wound on an iron core of 16 cm2 cross sectional area and with a cut of air gap length of 1 mm. The coil is connected to a 230 V, 50 Hz supply. Neglected coil resistance, core loss, iron reluctance and leakage inductance. Find the current in the inductor.

 18.08 A.
 4.56 A.
 2.28 A.
 9.04 A.

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Electromagnetic Field Theory
The magnetic vector potential due to a single conductor carrying current is

 zero.
 none of tha above.
 infinite.
 finite.

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Electromagnetic Field Theory
The electric flux is given D = (2y2 + z) Ix + 4xy Iy + x Iz C/m2. The volume charge density at point (-1, 0, 3) is

 0 C/m3.
 - 2 C/m3.
 - 8 C/m3.
 - 4 C/m3.

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