2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/196534Using a toy model of a two dimensional accretion disk, we discuss further the radial equation of the accretion flow dominated by the Poynting flux. Assuming the force-free condition is valid around the accretion disk, the relation between the fluid angular velocity of the disk, $Ω_D$, and the angular velocity of the magnetic field lines, $Ω_F$, is also discussed.11 pages, typos correctedAstrophysicstext