2013年8月9日星期五

the electromagnet inventor

the electromagnet inventor
1822, French physicist Arago and Gay-Lussac found that when the current through the winding which has iron, it can make the iron wire magnetized. This is actually the original discovery of the principle electromagnet. 1823, Sturgeon also did a similar experiment: cup magnet He is not in a U-shaped iron bar magnet stick around for 18 laps on the bare copper, when copper and voltaic cell is turned on, around the U type iron bar on the copper coils that produce a dense magnetic field, thus making U-shaped iron bar into a "magnet." This magnetic energy than the permanent magnet on the big release times can be, it can pick up more than 20 times its weight of iron, and when the power is cut off, U-shaped iron rods on what it could not suck again become an ordinary iron bar.

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