Hi all, A closed cylinder of Length L, with a radius r and a thickness d is filled with m1q1+m2q2 charges. Their respective volume charge densities are [tex]\rho[/tex]1 and [tex]\rho[/tex]2. The volume is surrounded with a neutral solute (n1q1+n2q2=0) with a volume charge density of [tex]\rho[/tex]3. (see picture). Case 1/ m2>m1 => m1q1+m2q2<0 Is there any attraction from the "core" to the outer charges? Does it depend of the charges densities and volume thickness?