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Permeance Coefficient, Pc: Raio of the magnetic induction, Bd, to its self demagnetizing force , Hd. Pc =  Bd/Hd. This is also known as the “load line” or operating point of the magnet, and is useful in estimating the flux output of the magnet in various conditions. As a first order approximation, Bd/Hd = Lm/Lg, where Lm is the length of the magnet, and Lg is the length of an air gap that he magnet is subjected to. Pc is therefore a function of the geometry of the magnetic circuit.



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