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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
0.5 J.
1.15 J.
0.15 J.
0.015 J.
0.5 J.
1.15 J.
0.15 J.
0.015 J.
Answer
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Related Question
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.
Yes
No
Yes
No
Answer
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Electromagnetic Field Theory
The heating time constant of an electrical machine gives an indication of its
short time rating.
cooling.
overload capacity.
rating.
short time rating.
cooling.
overload capacity.
rating.
Answer
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Electromagnetic Field Theory
A point charge in space is attracted towards a dielectric material because of the
all of above.
maximisation of electrostatic flux.
phenomenon of dielectric polarisation.
dielectric hysteresis.
all of above.
maximisation of electrostatic flux.
phenomenon of dielectric polarisation.
dielectric hysteresis.
Answer
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Electromagnetic Field Theory
A wire carrying current is bent in the form of a circular loop. Then the magnetic field around each portion of the wire will be
perpendicular to the circumference of the wire.
none of above.
parallel to half portion and perpendicular for the other half.
parallel to the plane of the wire.
perpendicular to the circumference of the wire.
none of above.
parallel to half portion and perpendicular for the other half.
parallel to the plane of the wire.
Answer
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Electromagnetic Field Theory
A long wire composed of a smooth round conductor runs above and parallel to the ground (assumed to be a large conducting plane). A high voltage exists between the conductor and the ground. The maximum electric stress occurs at
upper surface of the conductor.
the ground surface.
midway between the conductor and ground.
lower surface of the conductor.
upper surface of the conductor.
the ground surface.
midway between the conductor and ground.
lower surface of the conductor.
Answer
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