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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.
300.
150.
600.
450.
300.
150.
600.
Answer
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Related Question
Electromagnetic Field Theory
A solid sphere made of insulating material has a radius R and has a total charge Q distributed uniformly in its volume. What is the magnitude of electric field intensity, E, at a distance r (o less than r less than R) inside the sphere
Qr/(4 π εo R3).
QR/(4π εo r3).
Q/(4 π εo r3).
3 Qr/(4 π εo R3).
Qr/(4 π εo R3).
QR/(4π εo r3).
Q/(4 π εo r3).
3 Qr/(4 π εo R3).
Answer
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Electromagnetic Field Theory
Mutual inductance between two magnetically coupled coils depends on
permeability of core.
the number of their turns.
cross sectional area of their common core.
all of above.
permeability of core.
the number of their turns.
cross sectional area of their common core.
all of above.
Answer
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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
2 ux.
– 2 ux.
– uy.
0.
2 ux.
– 2 ux.
– uy.
0.
Answer
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Electromagnetic Field Theory
When a conductor moves in the field, so that it makes an angle 8 with the lines of flux, the force F is given as : F = Bl sin2 0.
No
Yes
No
Yes
Answer
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Electromagnetic Field Theory
According to maximum power transfer theorem, the maximum power is absorbed by one network from another network when
The impedance of one is the complex conjugate of the other
The impedance of one is equal to that of the other
The impedance of one of the networks is half that of the other
None of these
The impedance of one is the complex conjugate of the other
The impedance of one is equal to that of the other
The impedance of one of the networks is half that of the other
None of these
Answer
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