Question

Can Coulomb force be negative?

Answer 1

1. We know that, according to the Coulomb's law, $F=\frac{q_1{q}_2}{4\pi {\epsilon }_0{r}^2}$
2. Where $F$ is the coulomb force, $r$ is the separation distance between two charges $q_1$and $q_2$.
3. The Coulomb force can be negative if according to the above expression the charge $q_1$ and $q_2$ are of opposite sign.