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Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
This may have been posted earlier so please forgive me: I was curious if anyone knows how this floats without falling? I though that it was not possible for a magnet to float in a static magnetic field.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
It floats on a piece of 'high-temperature' superconductor cooled down with liquid nitrogen.
Since it has no resistance magnet induces ''eddy currents'' wich in turn induce a field repulsive to magnet, actually hindering it's movement in all directions.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Mechanism is quite different there: magnet will induce 'opposing' field at any side it is moved, and will be pushed away into sort of equilibrium just in the middle of superconductor.
If it was replaced by another magnet the first one would just be repelled from it's pole and thrown away on side.
Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
The simple answer is that the superconductor repels both poles of the magnet. It's a seriously cool video clip though (and I don't mean it's at 77K) Earnshaw's theorem says it's impossible for a magnet to float like that in a static field- there are two ways of looking at this "exception" one is to say that he simply forgot about diamagnetic materials; the other is to say that, inside the superconductor, there are a whole lot of electrons running round in circles generating the field that holds up the magnet. Since the electrons are moving, it isn't a static system.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
I have a piece, but still haven't convinced my dad to bring home some LN2 to get it to do anything fun (he spends at least an hour a day working in a room with a LN2 tap in it). But I haven't really tried either....
In any case, I will make sure you guys know when I finally get around to making it do anything more than sit in a foam box
I was lobbying to get a kit with the flux pinning stuff, but we decided to try the normal kind and a new cloud chamber instead. Gotta love rich grandparents that know about Edmunds Scientific
BTW, the pic on the edmunds site is wrong, it actually looks like
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Floating magnet
