Friday, July 27, 2012
Permanent magnets
I’ve always wondered how magnets were made and why their magnetism wears off after a period of time. I remember back in my school days we were taught o create our own magnet by stroking a metal like a nail with another magnet, a process known as magnetizing. I wonder these are the magnets that wear off their magnetism after a while, unlike the real magnets or permanent magnets which are supposed to stay magnetized forever. So where do these permanent magnets come from?
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