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Electromagnetic Field Theory

Electromagnetic Field Theory
For an inductor, current is proportional to

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

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Electromagnetic Field Theory
The drawback of Daltons atomic structure is that, it says

 most of the volume of an atom is empty space.
 the atoms can neither be created nor be destroyed.
 none of these.
 unique nature of atom.

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Electromagnetic Field Theory
Skin depth is proportional to

 Frequency.
 Permeability.
 1/√σ.
 √(σ).

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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

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

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Electromagnetic Field Theory
A point pole has a strength of 4π × 10-4 weber. The force in newtons on a point pole of 4π × 1.5 × 10-4 weber placed at a distance of 10 cm from it will be

 7.5 N.
 20 N.
 15 N.
 3.75 N.

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Electromagnetic Field Theory
A coil of 300 turns is wound on a non-magnetic core having a mean circumference of 300 mm and a cross sectional area of 300 mm2. The current of 3 A will be

 37.68 µH.
 113.04 mH.
 37.68 mH.
 113.04 µH.

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MORE MCQ ON Electromagnetic Field Theory

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