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Electromagnetic Field Theory

Electromagnetic Field Theory
Skin depth is proportional to

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

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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 2/d3.
 PR/d.
 PR/d2.

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Electromagnetic Field Theory
What is the value of total electric flux coming out of a closed surface?

 Equal to volume change density.
 Equal to the surface charge density.
 Zero.
 Equal to total charge enclosed by the surface.

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Electromagnetic Field Theory
Find the strength of the magnetic field when a 2m long conductor is moving with a velocity 4m/s inducing an emf of 20V.

 5T.
 2.5T.
 0.5T.
 10T.

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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.
 unique nature of atom.
 none of these.
 the atoms can neither be created nor be destroyed.

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Electromagnetic Field Theory
An inductor designed with 400 turns coil wound on an iron core of 16 cm2 cross sectional area and with a cut of air gap length of 1 mm. The coil is connected to a 230 V, 50 Hz supply. Neglected coil resistance, core loss, iron reluctance and leakage inductance. Find the current in the inductor.

 18.08 A.
 4.56 A.
 2.28 A.
 9.04 A.

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MORE MCQ ON Electromagnetic Field Theory

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