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magnetic reluctance
Magnetic reluctance, or magnetic resistance, is a concept used in the analysis of magnetic circuits. It is analogous to resistance in an electrical circuit, but rather than dissipating electric energy it stores magnetic energy. In likeness to the way an electric field causes an electric current to follow the path of least resistance, a magnetic field causes magnetic flux to follow the path of least magnetic reluctance. It is a scalar,
extensive quantity, akin to electrical resistance. The unit for magnetic reluctance is inverse henry, H−1.
==History==
The term was coined in May 1888 by Oliver Heaviside.〔Heaviside O., Electrical Papers, Vol 2 – L.; N.Y.: Macmillan, 1892, p.166〕 The notion of “magnetic resistance” was first mentioned by James Joule〔Joule J., Scientific Papers, vol 1 – 1884, p.36〕 and the term "magnetomotive force” (MMF) was first named by Bosanquet.〔Bosanquet, Phil. Mag., vol 15, 1883, p.205〕 The idea for a magnetic flux law, similar to Ohm's law for closed electric circuits, is attributed to H. Rowland.〔Rowland H., Phil. Mag. (4), vol 46, 1873, p.140〕
Reluctance is usually represented by a cursive capital .
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