Abstract
A method was investigated for measuring the value of B·dB/dx, which determines the magnetic force exerted on paramagnetic or diamagnetic substances. For this purpose, the change in the surface shape of fluids under inhomogeneous fields due to a phenomenon called the Moses effect, was used. When the space between two electrodes is filled with an electric conductive solution whose shape changes with the fields, the effective cross-section of the solution changes. As a result, the resistance between the electrodes also changes. The surface slope angle of an MnCl2 solution was estimated for a wide range of B·dB/dx values, and the relationship between the B·dB/dx values and the resistance was calculated. Experimentally, we observed the resistance change expected according to the calculation. A system using two non-miscible liquids with different conductivities was also proposed for the detection of lower field gradients.
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