A point charge q with charge q $=4\mathrm{.}0$nC is at the point ~r$0=(4\mathrm{.}0$cm$,4\mathrm{.}0$cm$,0).$

Calculate the electric field at the point ~rP $=(8\mathrm{.}0$cm$,12\mathrm{.}0$cm$,0).$ A point charge q with charge q $=4\mathrm{.}0$nC is at the point ~r$0=(4\mathrm{.}0$cm$,4\mathrm{.}0$cm$,0).$

Calculate the electric field at the point ~rP $=(8\mathrm{.}0$cm$,12\mathrm{.}0$cm$,0).$