FIGURE $23-9$

$2)$ Two point charges of magnitude $\backslash (+4\mathrm{.}0\backslash$mu $\backslash$mathrm$\{$C$\}\backslash )$ and $\backslash (-4\mathrm{.}0\backslash$mu $\backslash$mathrm$\{$C$\}\backslash )$ are placed as shown in Fig. $23-9.$

A$)$ What is the potential at point A$?(2$ points$)$

B$)$ What is the potential at point B$?(2$ points$)$

C$)$ How much energy would an electron gain $($or lose$)$ if moved from A to B$?(2$ points$)$