The electric charge density is given by a s Q2 .00") = Q1530\") + 2 5(1" R) 471'? That is, there is a point charge Q1 at the origin and a surface charge a = 4Q]; on the surface of a sphere of radius 7? R centered about the origin. a) What is the electrostatic energy of this system of charges? [3) Show that your answer is correct in appropriate limits