[QUE/EM-03024] --- EM-PROBLEM

Find the interaction energy of two interpenetrating spheres of uniform charge density \(\rho_1\) and \(\rho_2\). Let the two spheres have equal radii \(a\) and let the separation of their centers be \(d< a\). Show that  your answer gives the value expected for the limiting case s (a) \(d=0\), and \(d=a\).

Panofsky and Philips