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. express your answer in terms of the variables r, q and coulomb constant k.

Explanation:

As we know that electric field inside the solid sphere is given by

here we know that

Q = total charge on the sphere

R = radius of the sphere

r = distance from the center of the sphere

now by the relation of potential difference and electric field we know that

now for the potential difference between centre and the surface we have

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

the answer is a. hope this .