Part A

Two charges are placed on the $x$ axis. A charge of $+q$ is placed at the point $x=+L,$ and a charge of $-q$ is placed at the point $x=-L.$ If $V=0$ infinitely far away from the charges, what is the potential at the origin?

$+\frac{kq}{2L}$

$0$

$-\frac{L}{kq}$

$+\frac{kq}{L}$