Tauri Posted July 10, 2007 Share Posted July 10, 2007 Hello. I need to know if there is ANY way that a magnet can be made to PUSH metal away, instead of attracting it. Thanks. Link to comment Share on other sites More sharing options...
YT2095 Posted July 10, 2007 Share Posted July 10, 2007 if you pass an electrical current through the metal, then yes it can Link to comment Share on other sites More sharing options...
insane_alien Posted July 10, 2007 Share Posted July 10, 2007 or if you have a metal that has a greater diamagnetic effect than ferromagnetic. Link to comment Share on other sites More sharing options...
Tauri Posted July 10, 2007 Author Share Posted July 10, 2007 ok... im not really a science geek, so i dont know what u meant in the last post. And in the first response, do u mean metal or magnet? Link to comment Share on other sites More sharing options...
insane_alien Posted July 10, 2007 Share Posted July 10, 2007 if something is diamagnetic it repels magnetic fields. if it is ferromagnetic it attracts magnetic fields. ferromagnetism is the usual kind of magnetism that you see in fridge magnets. have a look on youtube for 'superconductor levitation' that will give you examples of superdiamagetism which is similar. Link to comment Share on other sites More sharing options...
Tauri Posted July 10, 2007 Author Share Posted July 10, 2007 Ok so if i get a magnet from a harddrive, and an object which has a stronger diamagnetic force than ferromagnetic (err...) force, i could push it away? Link to comment Share on other sites More sharing options...
YT2095 Posted July 10, 2007 Share Posted July 10, 2007 if you pass a DC current through Any conducting material with sufficient power a magnet will repel when placed in the right position. that`s how Speakers and moving coil meters work Link to comment Share on other sites More sharing options...
insane_alien Posted July 10, 2007 Share Posted July 10, 2007 Ok so if i get a magnet from a harddrive, and an object which has a stronger diamagnetic force than ferromagnetic (err...) force, i could push it away? well, pyrolytic carbon would work with it but thats about it. it takes about 10T to levitate a frog using this effect. Link to comment Share on other sites More sharing options...
Tauri Posted July 10, 2007 Author Share Posted July 10, 2007 well... where would i get some pyrolytic carbon? Link to comment Share on other sites More sharing options...
insane_alien Posted July 10, 2007 Share Posted July 10, 2007 not so sure on that, i've never needed it before. Link to comment Share on other sites More sharing options...
Rocket Man Posted July 11, 2007 Share Posted July 11, 2007 if you can hold lots of carbon dioxide at a few thousand degrees celcius for a few days you can flake a tiny bit off the bottom of the container. having said that, you can see why it's hard to find and costs a lot. bizmuth works too, it's just way less cool. unless you chill it (superconducts in liquid nitrogen, not very well though). bizmuth can be levitated above a suitably strong magnetic field, those magnets from a hard drive might work but you'll need a tiny flake of the bizmuth. i think you can buy it as shot, get one pellet and hammer it flat. Link to comment Share on other sites More sharing options...
shadowacct Posted July 11, 2007 Share Posted July 11, 2007 http://www.emovendo.net/magnet/pyrolytic-graphite-block.html http://www.emovendo.net/magnet/bismuth-metal-balls-9999-17-ozs.html Link to comment Share on other sites More sharing options...
John Cuthber Posted July 11, 2007 Share Posted July 11, 2007 The point is that yes a magnet can push metal, but only if it's the right metal. As a matter of fact, magnets push water but not very hard. Link to comment Share on other sites More sharing options...
alan2here Posted July 12, 2007 Share Posted July 12, 2007 well... where would i get some pyrolytic carbon? That link on the post before last (TY Shadowacct) EBay (Set up a google allert to help you) If you live in the USA then http://sci-toys.com/index.html It seems to more commonly be known as "pyrolytic graphite" It's rather pricey and you need to be into magnets esspecally NIB (Neodymium Iron Boron) magnets to appreciate it, if you have no NIB magnets then you will likely not be able to do anything with it and if you are new to magnets then you will likely get frustrated before you can do anything good with it. It also only works in one direction. Bistmuth is cheaper and works in all directions but is weaker. Water is also as already mentioned very slightly diamagnetic (works best as ice cubes) but you need carefully constructed rigs to really be able to tell. (Just using really large powerful magnets and trying to arrange things by hand doesn't work) Link to comment Share on other sites More sharing options...
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