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Electromagnetic Field Theory
A magnetic material has a total flux B of 80 micro Wb with an mmf of 160 AT. The reluctance in ampere turn per weber is
2 × 108.
2 × 106.
2 × 10-8.
2 × 10-6.
2 × 108.
2 × 106.
2 × 10-8.
2 × 10-6.
Answer
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Related Question
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.
300.
150.
600.
450.
300.
150.
600.
Answer
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Electromagnetic Field Theory
Mutual inductance between two magnetically coupled coils depends on
the number of their turns.
permeability of core.
cross sectional area of their common core.
all of above.
the number of their turns.
permeability of core.
cross sectional area of their common core.
all of above.
Answer
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Electromagnetic Field Theory
Whenever the magnetic flux changes with respect to an electric conductor or a coil, an EMF is induced in the conductor is Faraday’s
first law
fourth law
third law
second law
first law
fourth law
third law
second law
Answer
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Electromagnetic Field Theory
Biot-Savarts law states the relation between magnetic intensity and
(A), (B), and (D) are all correct.
filament current only.
surface current only.
volume current only.
(A), (B), and (D) are all correct.
filament current only.
surface current only.
volume current only.
Answer
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Electromagnetic Field Theory
The tubes of force within the magnetic material are known as
tubes of indication.
lines of force.
none of them.
magnetic flux.
tubes of indication.
lines of force.
none of them.
magnetic flux.
Answer
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