Ve. Shcherbinin et An. Pechenkov, Calculations of forces on magnetic dipoles as applied to problems of magnetic-powder defectoscopy, PHYS MET R, 89, 2000, pp. S80-S83
The calculation of forces that act on a magnetic particle located in the ma
gnetic field of a defect was performed. It is shown that in the presence of
an applied (magnetizing field), repulsion forces appear near the defect (i
n the absence of a magnetic field, only attraction forces exist).