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Electromagnetic Field Theory

Electromagnetic Field Theory
For an inductor, current is proportional to

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

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Electromagnetic Field Theory
The core of coil length is 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be

 24 mH.
 12 mH.
 3 mH.
 48 mH.

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Electromagnetic Field Theory
A rectangular loop in the x – z plane bounded by the lines x = 0, x = a, z = 0 and z = b is in a time varying magnetic field is given by B = B0 cosωt + ay. Where B0 is constant, ω is angular frequency and ay unit vector in the y direction. Now the emf induced in the loop is given by

 ab Bo cosω t.
 Zero.
 Bo ω sinω t.
  abω Bo sinω t.

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Electromagnetic Field Theory
A pure inductor when connected across 220 V, 50 Hz supply consumes 100 W. From the above statement it can be concluded that

 the inductor is non linear.
 the inductor has ferrite core.
 the inductor is made of thin wire.
 the above statement is false.

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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

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

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Electromagnetic Field Theory
The magnetic field required to reduce the residual magnetism to zero is called

 Coercivity.
 Hysteresis.
 Saturation magnetism.
 Retentivity.

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