Three charges are placed along $x$-axis at $x=-a, x=0$ and $x=a$ as shown in the figure. The potential energy of the system is
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(b)
$U=\frac{-k q^2}{a}-\frac{k q^2}{a}+\frac{k a^2}{2 a}$
$U=\frac{-3 k q^2}{2 a}$
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