\(_{F_{32}=\ k\frac{Q3\ Q2}{r_{32}^2}=\ 9x10^9\frac{Nm^2}{c^2}\ \ \ \ \ \ \ \ \ \ \frac{\left(65x10^{-6}c\right)\left(50x10^{-6}c\right)}{\left(0.3m\right)2}\ \ \ \ =325N}\)
\(F_{_{32}=k\ \frac{Q3\ Q1}{r_{31}^2}=9x10^9\frac{Nm^2}{c^2}\ \ \ \frac{\left(65x10^{-6}c\right)\left(-86x10^{-6}\right)}{\left(0.6\right)^2}}\)