I wish to light a LED by moving a permanent magnet relative to an inductor consisting of a coil of copper wire. Can I increase efficiency (current produced for a given magnet motion) by using an iron or ferrite core in my magnetic coil?
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Of course, that is what is regularly done in all common AC generators - the coils are wound on special steel poles with high permeability. Well placed ferromagnetic core can increase the induced emf in wires by three and even more orders of magnitude.
answered Oct 12, 2018 at 23:50