## outer electric potential, $$\psi$$

https://doi.org/10.1351/goldbook.O04349
@E01935@ outside the phase concerned. For a conducting sphere of excess charge $$Q$$ and radius $$r$$ in vacuum $$\psi =\frac{Q}{4\ \pi \ ɛ_{0}\ r}$$.
Source:
Green Book, 2nd ed., p. 59 [Terms] [Book]