A point charge is held stationary at the origin

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A point charge

q_1

is held stationary at the origin. A second charge

q_2

is placed at point

A

, and the electric potential energy of the pair of charges is

-6.4\times10^{-8}\ \mathrm{J}

. When the second charge is moved to point

B

, the electric force on the charge does

4.2\times10^{-8}\ \mathrm{J}

of work. What is the electric potential energy of the pair of charges when the second charge is at point

B