$21\mathrm{.}39-$ Two point charges are separated by $25\mathrm{.}0$ cm $($Fig$.$ E$21\mathrm{.}39).$ Find the net electric field these charges produce at $($a$)$ point A and $($b$)$ point $B.($c$)$ What would be the magnitude and direction of the electric force this combination of charges would produce on a proton at $A?$

Figure E$21\mathrm{.}39$ Can you use gresa format I would like to see