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Electromagnetic Field Theory
Materials subjected to rapid reversals of magnetism should have
high permeability.
low permeability.
low hysteresis loss.
both a and b.
high permeability.
low permeability.
low hysteresis loss.
both a and b.
Answer
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Related Question
Electromagnetic Field Theory
The lagging of flux density behind the applied magnetising force is known as
All of these
flux.
hysteresis.
permeance.
All of these
flux.
hysteresis.
permeance.
Answer
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Electromagnetic Field Theory
The two windings of a transformer have an inductor of 2 H each. If mutual inductor between them is also 2 H, then
turns ratio of the transformer is also two.
none of these.
it is a perfect transformer.
transformer is an ideal transformer.
turns ratio of the transformer is also two.
none of these.
it is a perfect transformer.
transformer is an ideal transformer.
Answer
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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.
600.
300.
150.
450.
600.
300.
150.
Answer
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Electromagnetic Field Theory
A circular ring is carrying uniformly distributed charge q and a point charge – Q on the axis of the ring. The magnitude of dipole moment of the charge system is (Assume distance between centre of ring and point charge is d and radius of ring R)
QR.
QR2/d.
Q√(R2 + d2).
QD.
QR.
QR2/d.
Q√(R2 + d2).
QD.
Answer
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Electromagnetic Field Theory
The magnitude of force acting on a current carrying conductor placed in a magnetic field is independent of
length of conductor.
flux density.
cross-sectional area of conductor.
current flowing through the conductor.
length of conductor.
flux density.
cross-sectional area of conductor.
current flowing through the conductor.
Answer
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