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Relevance. Rating Newest Oldest. Best Answer: In a generator, residual magnetism, also known as 'remanence' or remanent flux, is due to the hysteresis of the magnetic material in the core. When the current is removed, the magnetic flux often remains at some non-zero value. This is a characteristic phenomenon of ferromagnetic materials.
When describing the grade of a neodymium magnet, this number is commonly referred to as the N number, as in Grade N52 magnets. In the picture at right, it is the area inside the box, under the curve. Brmax (Residual Induction) - Also called Residual Flux Density.