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Electromagnetic Field Theory

Electromagnetic Field Theory
In above question no. 9, the average force on the core to reduce the air gap will be

 3332.47 N.
 6664.8 N.
 832.29 N.
 1666.22 N.

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Electromagnetic Field Theory
An electric dipole of moment P is placed in front of a ground sphere. The change induced on the surface of the sphere is (Assume radius of sphere = R and distance from dipole to centre of sphere = d)

 Zero.
 PR/d.
 PR 2/d3.
 PR/d2.

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Electromagnetic Field Theory
What is the value of skin depth as 100 Hz in a material having μr = 1.0 and & σ = 3.60 × 107 s/m

 2.4 mm.
 8.4 mm.
 10 mm.
 4 mm.

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Electromagnetic Field Theory
inductance (L2) in parallel without mutual coupling will be

 5 mH.
 10 mH.
 20 mH.
 15 mH.

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Electromagnetic Field Theory
For an inductor, current is proportional to

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

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Electromagnetic Field Theory
Conductor is varying and field is fixed then emf will be induced. This principle is called

 static induced emf.
 both A and B.
None of these
 dynamically induced emf.

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