2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/25549We compute the free energy for two rows of localized adsorption sites embedded in a two dimensional one-component plasma with neutralizing background density $ρ$. The interaction energy between the adsorption sites is repulsive. We also compute the average occupation number of the adsorption sites and compare it to the result for a single row of sites. The exact result indicates that the discretization does not induce charge asymmetry and no attractive forces occur.10 pages 5 figuresSoft Condensed MatterStatistical Mechanicstext