2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35632The electromagnetic field is studied in a family of exact solutions of the Einstein equations whose material content is a perfect fluid with stiff equation of state (p = $ε$ ). The field equations are solved exactly for several members of the family.6 pages, REVTEX,no figuresGeneral Relativity and Quantum Cosmologytext