corn wo. spherically symmetric (non-uniform) charge distribution 53. The volume charge density of a solid nonconducting sphere of radius R = 5.60 cm varies with radial distance r as given by p = Ar. (a) What is the sphere's total charge? Hint: what is the infinitesimal differential volume dV of a spherical shell of thickness dr and radius r? (b) What the charge enclosed to the sphere of radius r (r R