A $+8\mathrm{.}0$ nCnC charge is located at $($x$,$y$)=(0$cm$,15$cm$)($x$,$y$)=(0$cm$,15$cm$)$ and a $-3\mathrm{.}0$ nCnC charge is located at $($x$,$y$)=(4\mathrm{.}0$cm$,0$cm$)($x$,$y$)=(4\mathrm{.}0$cm$,0$cm$).$