An electrolyte (an aqueous solution of CuSO4, NaCl, ...) in a
shallow tray is made to rotate in the field of a permanent magnet
(a small "pill" placed under the tray). The electric field is applied from
a 1.5 V battery in such a way that one electrode is in the form of a
conducting ring immersed in the electrolyte - the other is a tip of a wire
placed vertically in the centre of the ring. Study the phenomenon and find
possible relationships between the variables.
Sketch of experimental setup