question_answer

Direction Q.11 to 15

Coulomb's law states that the electrostatic force of attraction or repulsion acting between two stationary points charges is given by

\[F=\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{{{q}_{1}}{{q}_{2}}}{{{r}^{2}}}\]

where F denotes the force between two charges \[{{q}_{1}}\]and \[{{q}_{2}}\] separated by a distance r in free space, e q is a constant known as permittivity of free space. Free space is vacuum and may be taken to be air practically.

If free space is replaced by a medium, then E o is replaced by \[\left( {{\varepsilon }_{0}}k \right)\]or \[\left( {{\varepsilon }_{0}}{{\varepsilon }_{r}} \right)\]where k is known as dielectric constant or relative permittivity.

Read the above passage carefully and give the answer of the following questions.

In Coulomb's law, \[F=k\frac{{{q}_{1}}{{q}_{2}}}{{{r}^{2}}}\], then on which of the following factors does the proportionality constant k depends?

A) Electrostatic force acting between the two charges

B) Nature of the medium between the two charges

C) Magnitude of the two charges

D) Distance between the two charges