Electrostatic self energy of a uniform density sphere

[ccheck13]

Homework Statement

"In class we calculated the electrostatic self energy of a uniform density sphere of charge, i.e., the work required to assemble the sphere from "infinite dispersal." Along the same lines, calculate the electrostatic self energy of a spherical shell of charge, of negligible thickness, radius a, and total charge Q. Note that the radius of the charge distribution does not vary as you build it up.

 

[aim1732]

I think you need to show your work first.

 

[Mandeep Deka]

What was your attempt to solution?