A point charge $7 \mu \mathrm { C }$ is placed at ( $- 9,0,0$ ) another point charge $- 2 \mu \mathrm { C }$ is placed at (9, 0, 0). Find potential energy of system.
A point charge $7 \mu \mathrm { C }$ is placed at ( $- 9,0,0$ ) another point charge $- 2 \mu \mathrm { C }$ is placed at (9, 0, 0). Find potential energy of system.