An electrolyte is in cylindrical glass reservoir. First metal electrode wrapped around inside of reservoir and second electrode is in central. Reservoir is in a uniform magnetic field wich is paralel with its vertical axis of symmetry.
Between electrodes there is current if the they enclose on electrical source. Efect of Ampers force on current is rotating elektrolyte. Viscons force(internal friction) is direction oposite the Ampers force and when these forces balance, we can find the angular speed, w:

I-current,
R-radius first electrode
r_o-radius second electrode,
r-radius and
B-induction of magnetic field.
Moving fluids is intersting to analize and best presentation is computer simulation