Two equal charges $q$ are placed at a distance of $2a$ and a third charge $ - 2q$ is placed at the midpoint. The potential energy of the system is
Two equal charges $q$ are placed at a distance of $2a$ and a third charge $ - 2q$ is placed at the midpoint. The potential energy of the system is
- A
$\frac{{{q^2}}}{{8\pi {\varepsilon _0}a}}$
- B
$\frac{{6{q^2}}}{{8\pi {\varepsilon _0}a}}$
- C
$ - \frac{{7{q^2}}}{{8\pi {\varepsilon _0}a}}$
- D
$\frac{{9{q^2}}}{{8\pi {\varepsilon _0}a}}$
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