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)

 PR 2/d3.
 PR/d.
 PR/d2.
 Zero.

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Electromagnetic Field Theory
The wave in wave guide has

Larger wavelength than in the free space
Group velocity inversely proportional to wavelength
Larger frequency than in the free space
Diminishing wavelength than in the free space

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