what is the potential inside a sphere
Some things to know, however, are that the potential at a point-inside-a charged sphere is always zero, and the potential at a point-outside-a charged sphere is equivalent to the potential caused by a point charge at the sphere's center (k*Q/r).
Moving from a point on the surface of the sphere to a point inside, the potential changes by an amount: Î´V = -â« E â¢ ds. Because E = 0, we can only conclude that Î´V is also zero, so V is constant and equal to the value of the potential at the outer surface of the sphere.