2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/223117We calculate the van der Waals dispersive interaction between a neutral but polarizable atom and a perfectly conducting isolated sphere in the nonretarded case. We make use of two separate models, one being the semiclassical fluctuating-dipoles method, the other using ordinary quantum mechanics.11 pages, 3 figuresQuantum Physicstext