Asolid sphere of radius r carries charge q distributed uniformly throughout its volume. find the potential difference from the sphere's surface to its center.

The potential difference from the sphere's surface to its center is zero.

Explanation:

The expression for the potential difference due to charge is as follows;

Here, is the potential difference, q is the charge, r is the position and is the absolute permittivity of free space.

In the given problem, a solid sphere of radius r carries charge q distributed uniformly throughout its volume.

To find the potential difference from the sphere's surface to its center. Put r=0 in the expression of the potential difference.

Therefore, the  potential difference from the sphere's surface to its center is zero.