The mathematical expression for electric potential due to a point charge is given by
where r is the distance between test charge q and point charge Q, and ε0 is permittivity.
1
\(V = \frac{Q}{{4\pi r{\varepsilon _0}}}\)
2
\(V = \frac{{Qr}}{{4\pi {\varepsilon _0}}}\)
3
\(V = \frac{r}{{Q \times 4\pi {\varepsilon _0}}}\)
4
\(V = \frac{1}{{rQ \times 4\pi {\varepsilon _0}}}.\)