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Determine the mutual inductance of a ...

Determine the mutual inductance of a doughnut coil and an infinite straight wire passing along its axis. The coil has recatangular cross-section, its inside radius is equal to `a` and the outside one, to `b`. The length of the doughtnut's cross-sectinla side parallel to the wire is equal to `h`. The coil has `N` turns. The system is located in a unifrom magnetic with permeability `mu`.

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