• Subject:

...

• Topic:

...

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

(1) $\frac{{q}^{2}}{8\pi {\epsilon }_{0}a}$

(2) $\frac{6{q}^{2}}{8\pi {\epsilon }_{0}a}$

(3) $-\frac{7{q}^{2}}{8\pi {\epsilon }_{0}a}$

(4) $\frac{9{q}^{2}}{8\pi {\epsilon }_{0}a}$