Autofluctuations of magnetic liquid drops in electrical and magnetic fields

V. V. Chekanov - N. V. Kandaurova

North Caucasian State Technical University, Stavropol, Russia

Abstract
The given work is a continuation of research physical process proceeding at occurrence of jet currents with surfaces of a magnetic liquid deformed by magnetic field. A drop of a magnetic liquid such as "magnetite in kerosene" was put between ferrite cores with spherical ends covered by a conducting layer. Observations have shown that at inclusion of a voltage on electrodes the thickness of the crosspiece in section which is taking place through the centre of symmetry perpendicular of the line being symmetry axis was increased. The form of a drop remained symmetrical. From here it is possible to make a conclusion that a volumetric charge of magnetic liquid is bipolar and Coulomb force in the left and the right half of drop are directed towards each other. Up to certain voltage these forces increasing pressure in the centre of a drop where sizes of volumetric charge z by virtue of symmetry is equal to zero result in increase of thickness the crosspieces. But the state when Coulomb forces working towards each other in both half of a drop become more than the sum of magnetizing and polarizing forces becomes unstable. In this case there should be autofluctuations or a current inside a drop if the thickness of crosspiece is more than some critical one. The movement equation of a drop is written down. The Relay equation for auto fluctuation of a drop is also written down.. Figs 3, Refs 7.