ABSTRACT
The ponderomotive mechanism of electromagnetic excitation of elastic oscillations in the magnetic fluid was initially regarded as the only possible mechanism. The ponderomotive mechanism is also characterised by the linear dependence of the amplitude of the generated sound on the amplitude of the alternating magnetic field. The coefficient of ponderomotive elasticity is measured using the method of the ‘attached cavity’ in which successive measurements are taken of the frequency of oscillations of the magnetic fluid membrane in a pipe open at one end and a pipe closed at both ends. The theoretical model of elasticity of the oscillatory system proposed by V. I. Drozdova, Yu. N. Skibin and V. V. Chekanov takes into account the capillary forces and the forces of the ponderomotive effect of the magnetic field. In contrast to the capillary force always directed in the direction of restoration of the spherical shape, the ponderomotive forces of the magnetic field act in the opposite direction.
