એક પોલો ગોળો જેની ત્રિજ્યા R છે તેના માટે

For hollow sphere ${V_{in}} = \frac{{ - GM}}{R}$, ${V_{{\rm{surface}}}} = \frac{{ - GM}}{R}, \,{V_{out}} = \frac{{ - GM}}{r}$

i.e. potential remain constant inside the sphere and it is equal to potential at the surface and increase when the point moves away from the surface of sphere.