This paper is concerned with the magnetic fluid surface instability produced by the external alternating magnetic field with lower strength amplitude. Periodic disintegration and reconnection of magnetic fluid bridge between two small permanent magnets were studied with a high-speed video camera analysis system. Disintegration and connection of the liquid bridge were generated by the external alternating magnetic field produced by the Helmholtz coil. The surface shape of magnetic fluid bridge was changed by the external field every moment. The details of surface phenomena on magnetic fluid bridge were revealed. The relation between the surface shape variation and the external magnetic field was discussed with the Bond numbers.
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