A small bar magnet is moving with constant velocity v towards a xed con- ducting ring of radius `a' along x-axis as shown in the gure. Electrical resistance of the ring is r and its self conductance can be neglected. The bar magnet can be modeled as magnetic dipole of dipole moment m. Find force of interaction between bar magnet and the ring when coordinate of magnet is (x; 0; 0) and x >> a.
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