Two thin concentric wires shpaed as circles with radii `a` and `b` lie in the same plane. Allowing for `a lt lt b`, find: (a) their mutual inductane,
Two thin concentric wires shpaed as circles with radii `a` and `b` lie in the same plane. Allowing for `a lt lt b`, find:
(a) their mutual inductane,
(b) the magnetic flux through the surface enclosed by the outside wire, when the inside wire carries a current `I`.
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