Based on the London theory, we have calculated the forces acting on a magnet placed above a superconductor. The results have been used to calculate (i) the forces acting on a spherical magnet over a superconducting plane; (ii) the forces acting on a ring-shape magnet above a superconducting plane; and (iii) the force between the tip of a magnetic force microscope (MFM) and a superconducting plane due to the diamagnetic response of the superconductor to the stray field of the tip.
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Zhongjin Yang (1992) studied this question.
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