In this paper, the pressure-induced flow between two relatively moving plane walls has been discussed, both for non-porous and porous walls. For non-porous walls it is found that with the vanishing of the electric fieldE, the increase in the strength of the magnetic field can cause separation near the stationary wall even when a slight adverse pressure gradient is applied. For the case of porous walls (with suction or injection) it is found that the magnetic field helps in delaying separation.