IB Physics: Magnetism and Electromagnetic Induction. - ppt video online download

IB Physics: Magnetism and Electromagnetic Induction. - ppt video online download: Magnetite: From Magnesia (Greece). Formula: Fe3O4. Description: Dark grey, slightly shiny. Magnetite is naturally magnetic. It is also called Lodestone. In Middle Ages, pilots were called lodesmen. The lodestar is the Polar star, the leading star by which mariners are guided. The name probably comes from Magnesia, but there is a fable of Magnes, a Greek shepherd, who discovered magnetite when the nails in his shoes stuck to the ground!