Liquid metal is forced through a narrow slit to form a two-dimensional stream. As it falls, it encounters a horizontal A.C. line current on the left of the picture, and is diverted towards the right by magnetic pressure. The deflection angle is well predicted by a straightforward theory.

For more detail see "Deflection of a stream of liquid metal by means of a high frequency magnetic field." Journal of Fluid Mechanics 194, pages 309-331, by J. Etay, A.J. Mestel and H.K. Moffatt.