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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.
The more accurate term is magnetization. How long a magnet takes to lose its magnetization is a function of what the magnetic materials is made up of, and how high a temperature you heat it too.At high temperatures, any magnet will lose its magnetization rather quickly (in a matter of minutes, if the temperature is high).agnets stay magnetized until something destabilizes them. The constant jostling of molecules (i.e. heat) slowly disorganizes the magnetic domains in a magnet, and this happens faster the hotter the magnet. Ultimately, a magnet will align itself to any pre-existing magnetic field, such as that of the Earth.