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#13
June 23rd 04, 07:59 AM
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"Don Klipstein" wrote in message ... In article , Steve wrote: --------------9002068B3CF78CE28C8CE7B3 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit what does it do?? They are magic, aren't they? Have you tried the drop a magnet down a copper pipe trick? The magnet moving down the pipe induces eddy currents. These eddy currents produce an electromagnetic force that resists the movement of the magnet (with respect to the pipe) and does so to an extent varying directly with the speed at which the magnet is moving. This slows down the magnet. At least this is what I have heard. And aluminum tubes do this also, just not quite as much as copper ones do. And I have seen aluminum tube stock. Most other metals do this less, but I imagine that iron and lead pipes may slow the fall of a close-fitting "rare earth magnet" a little in comparison to nonconductive pipes. Well, iron for sure. |
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