This article deals with the impact of a magnetic field on the hydrodynamic behavior of a fluidized bed. It can be proven that a homogenous magnetic field stabilizes the system. In this way turbulent motion achieves a minimum, which effects the residence time distribution and results in a decrease of the axial dispersion rate. Measurements concerning the residence time were done and determined using the dispersion model. The external magnetic field does not influence the minimum fluidization velocity, but the pressure drop decreases with an increasing magnetic field.