La naturaleza y orígen del magnetismo aún no han sido explicados completamente. Se han formulado varias teorías explicando el fenómeno magnético, pero no ha habido aprobación unánime. Imán En magnesia, antigua ciudad de Asia Menor, se encontraron los imánes naturales o Piedra imán, descubiéndose que estas atraían cuerpos pequeños de hierro, más tarde se le llamo óxido de hierro y en Química se le denomina óxido magnético...

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