Two spheres of identical radius R are placed side by side. The first sphere carries a uniform volume charge distribution P1, net charge Q1, and its center is located at R = -2Ri. The second sphere carries a uniform volume charge distribution P2, net charge Q2, and is centered at the origin. This is illustrated at the top of the page. What must be the ratio Q2/Q1 if the net electric field is 0 at 7Ï€2R^2?