Physics of Dielectrics - Electric PE of a Uniformly Charged Sphere and Spherical Shell

The electric potential energy of a uniformly charged sphere of radius R is the work done in bringing the charges from infinity to assemble the sphere. How this work done can be calculated,has been discussed in this video. Similarly the electric potential energy of a charged spherical shell is equal to the work done in bringing charges from infinity and put them on the shell. The appropriate calculation for this has been also made.