Two point charges and are fixed apart in air

PHYSICS · Single correct · CBSE · Physics · Electrostatic Potential and Capacitance · Electrostatic Potential and Capacitance

Problem

Two point charges

+3\,\mu\text{C}

and

+2\,\mu\text{C}

are fixed

10\,\text{cm}

apart in air. The region between them is then completely filled with a dielectric material of constant

K=5

, without altering their positions. What is the ratio of their new potential energy to the original potential energy? (a)

5

(b)

1

(c)

\dfrac{1}{5}

(d)

\sqrt{5}