2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/149215In several unified field theories the torsion trace is set equal to the electromagnetic potential. Using fibre bundle techniques we show that this is no leading principle but a formal consequence of another geometric relation between space-time and electromagentism.Report number corrected, 6 pages, uses LaTeXHigh Energy Physics - TheoryGeneral Relativity and Quantum Cosmologytext