Physics

Problem

A point

P

2\,\text{cm}

away from an isolated charge, and its electric potential is measured to be

+80\,\text{V}

. Point

Q

lies on the same line at a distance of

4\,\text{cm}

from the charge. Which one of the following gives the electric potential at

Q

? a)

+160\,\text{V}

+20\,\text{V}

+40\,\text{V}

-40\,\text{V}