2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/86691We investigated the Onsager relations in the context of electromagnetic constitutive relations of linear, homogeneous materials. We determined that application of the Onsager relations to the constitutive equations relating $#P$ and $#M$ to both $#E$ and $#B$ is in accord with Lorentz reciprocity as well as the Post constraint.5 pagesOpticstext