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Electromagnetic Field Theory

Electromagnetic Field Theory
For an inductor, current is proportional to

 magnetic field.
 both (A) and (B).
 voltage across the inductor.
 none of them.

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Electromagnetic Field Theory
Find the length of a conductor which is moving with a velocity 0.4m/s in a magnetic field of 8T, inducing an emf of 20V.

 5.25m.
 0.5m.
 0.6m.
 6.25m.

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Electromagnetic Field Theory
In an impedance smith chart, a clockwise movement along a constant resistance circle gives rise to

An increase in the value of reactance
No change in the impedance value
No change in the reactance value
Decrease in the value of reactance

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Electromagnetic Field Theory
When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon

None of these
The weight of the conductor
The value of current
The direction of the conductor

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Electromagnetic Field Theory
The coils having self inductance of 10 mH and 15 mH have an effective inductance of 40 mH, when connected in series aiding. What will be the equivalent inductance if we connect then in series opposing?

 0 mH.
 5 mH.
  10 mH.
 20 mH.

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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

 it is a perfect transformer.
 turns ratio of the transformer is also two.
 transformer is an ideal transformer.
 none of these.

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