A point is away from an isolated charge

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

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}

(b)

+20\,\text{V}

(c)

+40\,\text{V}

(d)

-40\,\text{V}