Question: Two thin concentric wires shaped as circles with radii a and b lie in the same plane. Allowing for a < < b, find: (a)

Two thin concentric wires shaped as circles with radii a and b lie in the same plane. Allowing for a << b, find:
(a) Their mutual inductance;
(b) The magnetic flux through the surface enclosed by the outside wire, when the inside wire carries a current I.

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