For a non-conducting sphere carrying uniform charge distribution, the electrical potential is given
as :
Outside (e.g. point P1) V = (1/4pe0) (Q/r)
 
At the surface (e.g. point P2)
V = (1/4pe0) (Q/R)
Inside the sphere (e.g. point P3)
The potential at the centre of the sphere is Vcentre = (3/2)(LQ/R). This is 1.5 times the potential at the surface of the sphere Vsurface = kQ/R
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