2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186990We consider Fermions in a constant and uniform external $SU(2)$ magnetic field. We find that the results for the energy levels depend on the choice of gauge potential. Choosing a Landau type gauge potential yields his results. On the other hand in another gauge potential, one obtains a different continuous eigenvalue spectrum.7 pages, LatexHigh Energy Physics - Phenomenologytext