What do you understand by the term reluctance? Obtain an expression for reluctance in a magnetic circuit made of an iron ring magnetised by a current flowing through a coil wound closely over it.

Reluctance is a fundamental concept in electromagnetic theory that quantifies the opposition offered by a magnetic circuit to the flow of magnetic flux, analogous to resistance in an electric circuit. It is represented by the symbol \( \mathcal{R} \) and is measured in ampere-turns per weber (A-turns/Wb) or inverse henries (H\(^{-1}\)). ____ _______ _____ __________ __________ _________ _____ _________ ________.
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