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A long horizontal rigidly supported wire...

A long horizontal rigidly supported wire carries a current `i_a` of 100 A. Directly above it and parallel to its is a fine wire that carries a current `i_b` of 20 A and weighs 0.073 N/m. How far above the lower wire should the second wire be kept if we wish to support it by magnetic repulsion?
Given permeability constant `mu_0= 4pi xx 10^-7 Wb A^-1m^-1`.

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