The analogous formula holds if charge density 1 is composed of interior cylindrical multipoles U = − − Q 1 ln ⁡ ⁡ ρ ρ ′ 2 π π ϵ ϵ ∫ ∫ d ρ ρ ρ ρ λ λ ( ρ ρ , θ θ ) + 1 2 π π ϵ ϵ ∑ ∑ k = 1 ∞ ∞ k ( C 2 k I 1 k + S 2 k J 1 k ) where I 1 k and J 1 k are the interior cylindrical multipole moments of charge distribution 1, and C 2 k and S 2 k are the exterior cylindrical multipoles of the second charge density.