Electromagnetic Field Theory
When a wave is incident from the more dense into a less dense medium at an angle equal to or exceeding the critical angle, the wave suffers total internal __________ .

Refraction
Transmission
Reflection
None of these

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

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