Anonconducting spherical shell, with an inner radius of 4.2 cm and an outer radius of 6.4 cm, has charge spread nonuniformly through its volume between its inner and outer surfaces. the volume charge density rhois the charge per unit volume, with the unit coulomb per cubic meter. for this shellrho=b/r, whereris the distance in meters from the center of the shell andb= 5.0 μc/m2. what is the net charge in the shell?