Electromagnetic Field Theory
A sphere of radius with a uniform charge density ρv C/m3 shall have electric flux density at radius “r = a” equal to

 aρv/3 C/m2.
 aρv/4 C/m2.
 aρv C/m2.
 ρv/3 C/m2.

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Electromagnetic Field Theory
The wave in wave guide has

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

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