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Transcript of Magnets
If it stays magnetic after the magnet is removed, it is a permanent magnet (ie, the alloy Alnico).
If the metal does not stay magnetized after the magnet is removed, it is a temporary magnet (iron).
How do things become magnetized? Magnetism is caused by the spin of the unpaired electrons. When they spin in the same direction, they cause microscopic magnets called domains. If all the domains are aligned, a magnet is formed. Magnetic poles always come in pairs (a single pole cannot be isolated).
If you break a magnet: common magnets Magnetic Field Lines If compasses are placed around a magnet, we can visualize the field around the magnet. In a ferromagnetic material (such as iron filings) are scattered around a magnet we can also visualize the field around a magnet. Field lines point in the direction a compass would point if placed there. Field lines always flow out of North, into South What to know about field lines! Field lines NEVER cross!
Field lines points out of north pole and into south pole.
Field lines form closed loops.