Electromagnetic Field Theory
Which is the major factor for determining whether a medium is free space, lossless dielectric or a good conductor

 Attenuation constant.
  Loss tangent.
 Reflector coefficient.
 Constitutive parameters.

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

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

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