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Electromagnetic Field Theory

Electromagnetic Field Theory
If the static magnetic flux density is B, then

 Divergence of B = J.
  Divergence of B = 0.
 Curl of B = J.
 Curl of B = 0.

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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
Ohm’s law in point from field theory can be expressed as

 J = E / σ.
 J = σE.
 V = IR.
 R = ρ × ( l / A).

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Electromagnetic Field Theory
In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as

Transmission efficiency
Loss coefficient
None of these
Front to back ratio

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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/d2.
 PR 2/d3.

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Electromagnetic Field Theory
A metal sphere with 1 m radius and a surface charge density of 10 coulombs/m2 is enclosed in a cube of 10 m side. The total outward electric displacement normal to the surface of the cube is

 5 C.
 10 C.
 40π C.
 None of above.

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