A nonhomogeneous magnetic field is generated electrochemically in an electrodeposition cell which is also an interferometer. Magnetic field strength near 0.5 T produce a detectable by interferometry convective slow relation in a diamagnetic electrolyte with electroactive (Cu2+) and indifferent (Mn2+) paramagnetic ions present in an otherwise stagnant solution with the cathode over the anode (C/A). Approximate calculation of forces and flows are attempted.