Gee Mr. Wizard, that was fun!!
That's a pretty large neodymium magnet.... I'll bet if that were an iron pipe he'd have trouble pulling that magnet off of it. Alot of folks don't realize how strong neodymium magnets are. Not sure if the eddy current would be nearly as strong trying to do that trick with a standard iron-ferrite magnet, for those planning on attempting.
Yep, I tried it at work this morning.8 inch long piece of 1.5 inch copper pipe and some magnets holding a calendar to the wall. Didn't work, must need those rare earth magnets.
I've never seen this and as a science person, this is friggin' sweet!
blasphemy!!
My son did this as his science fair project last year (he's 12). I didn't hurt that I used to work for a company that made NeFeB Magnets. All has to do with Eddy Currents. It can be done with a brass pipe as well, although it is not quite as spectacular. As to the post that talked about the "flashlights" that was the science fair project from the year before. Move a magnet through coils with different number of turns of wire, and measure the generated current. The magnets we used are about 1" long and about 3/4" in diameter. Use caution around electronics, I have wiped out a digital watch and have seen an early digital camera wiped out with a rare earth magnet.
The copper pipe and amazingness of the magnetic science reminds me a cool video I ran across today. Induction forges:
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Cool vid. I bought one of those magnets on Ebay.
http://www.ebay.com/itm/Strong-Magn...ltDomain_0&hash=item53eb05c897#ht_3202wt_1109
http://www.ebay.com/itm/Strong-Magn...ltDomain_0&hash=item53eb05c897#ht_3202wt_1109
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