Electromagnetic Field Theory
According to Coulomb’s law, the force of attraction or repulsion, between to electrical charges is

 inversely proportional to the distance between them.
 inversely proportional to the square of the distance between them.
 directly proportional to the square of the distance between them.
 directly proportional to the distance between them.

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Electromagnetic Field Theory
The wave in wave guide has

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

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