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Electromagnetic Field Theory
In an iron core coil the iron core is removed so that the coil becomes an air core coil. The inductance of the coil will
initially increase and then decrease.
increase.
decrease.
remain the same.
initially increase and then decrease.
increase.
decrease.
remain the same.
Answer
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Related Question
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
A loop antenna is a commonly used for
Radar
Satellite communication
All of these
Direction finding
Radar
Satellite communication
All of these
Direction finding
Answer
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Electromagnetic Field Theory
The effective reactance of an inductive coil
decreases because of stray capacitance as the frequency increases.
none of these.
remains same irrespective of the frequency.
increases because of stray capacitance as the frequency increases.
decreases because of stray capacitance as the frequency increases.
none of these.
remains same irrespective of the frequency.
increases because of stray capacitance as the frequency increases.
Answer
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Electromagnetic Field Theory
An electric field on a place described by its potential V = 20 (r -1 + r-2) where r is the distance from the source. The field is due to
A monopole.
Both of A and B.
A dipole.
A quardra pole.
A monopole.
Both of A and B.
A dipole.
A quardra pole.
Answer
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Electromagnetic Field Theory
The energy stored in the magnetic field at a solenoid 30 cm long and 3 cm diameter wound with 1000 turns of wire carrying an current at 10 A, is
0.15 J.
0.5 J.
0.015 J.
1.15 J.
0.15 J.
0.5 J.
0.015 J.
1.15 J.
Answer
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