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# Potential of Two Identical Charges on a Line at the Origin

EANDM-$EG@98 Figure 1 depicts a pair of negatively charged particles, each having a charge of$-q$, arrayed along the$\hat{x}$axis, symmetrically about the origin. What is the electric potential$V$at the origin of the$\hat{x}$axis? Take$k = 8.99 \times 10^9 \text{ N} \cdot \text{ m}^2 / \text{C}^2$as the electric force constant. A$V = -\frac{2kq}{a}$B$V = -\frac{4kq}{a}$C$V = 0$D$V = -\frac{8kq}{a^2}\$