2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/84848For a monopole, the analogue of the Lorentz equation in matter is shown to be f = g (H - v cross D). Dual-symmetric Maxwell equations, for matter containing hidden magnetic charges in addition to electric ones, are given. They apply as well to ordinary matter if the particles possess T-violating electric dipole moments. Two schemes of experiments for the detection of such moments in macroscopic pieces of matter are proposed.7 pages, 3 figures. Presented at the Int. Conf. QEDSP 2001, dedicated to the 90th anniversary of Alexander Il'ich Akhiezer (Kharkov, Ukraine, Oct. 30 - Nov. 3, 2001). To appear in the proceedingsGeneral PhysicsClassical Physicstext