Electromagnetic Field Theory
A solid sphere made of insulating material has a radius R and has a total charge Q distributed uniformly in its volume. What is the magnitude of electric field intensity, E, at a distance r (o less than r less than R) inside the sphere

 Qr/(4 π εo R3).
 Q/(4 π εo r3).
 QR/(4π εo r3).
 3 Qr/(4 π εo R3).

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

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