2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/104019A finite-difference time-domain (FDTD) numerical analysis is used to demonstrate that a toroidal solenoid, coaxial with an electric dipole, is a remarkable non-radiating configuration. It can be used to measure the dielectric permittivity of any ambient matter. It becomes a directional radiator at an interface between two dielectric media, depositing energy in the material with the highest polarizability.15 pages, 8 FiguresClassical PhysicsMaterials ScienceComputational Physicstext