I never _had_ the ebay link, and since the OP says s/he "got" the item, presumably it is no longer for sale there.
Has this functional illiteracy problem been bothering you for a long time, or is it new?
If the latter, an MRI might be a good idea.
The emergency room caretakers found a brain tumor the size of a small orange in my fiancee's head, that was giving little more sign than that of being around, until the crisis hit.
xanthian, she's no longer got the tumor, and she's regathered most of her faculties since the tumorectomy. I'm hoping to have her home in a month or so.
As far as an explanation, as that website points out, pyrolithic graphite is paramagnetic. That means when you bring it close to, for example, the north pole of a magnet, then the material becomes temporarily magnetized with the north pole on the side closest to the magnet. If you bring it near a south pole, it's magnetized with the south pole closest to the magnet.
The Wikipedia article on diamagnetism offers a decent semi-classical explanation of why this happens. Of course, for the most correct explanation one would need to grind through the math of quantum mechanics. Just bear in mind that an electron in an atom doesn't follow a single, well-defined path; instead, there's a probability for finding the electron that varies from place to place.
From
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"Consider two electron orbitals; one rotating clockwise and the other counterclockwise. An external magnetic field into the page will make the centripetal force on an electron rotating clockwise increase, causing it to speed up. That same field would make the centripetal force on an electron rotating counterclockwise decrease, causing it to slow down. The orbiting electrons create magnetic fields themselves, and in both cases, the change in B due to the electron's change in velocity is in the opposite direction to the external B field. Since the material originally had no net magnetic field from its orbiting electrons (because their orbits were aligned in random directions), the result is that the induced B field opposes the applied B field, and these repel each other."
"All materials show a diamagnetic response in an applied magnetic field. In fact, diamagnetism is a very general phenomenon, because all paired electrons, including the core electrons of an atom will always make a weak diamagnetic contribution to the material's response. However, for materials which show some other form of magnetism (such as ferromagnetism or paramagnetism), the diamagnetism is completely overpowered."
Of course, it might be that the original poster wanted to know why pyrolithic graphite is so strongly diamagnetic compared to other materials, but I don't know the answer to that.
--
Jim E. Black (domain in headers)
How to filter out stupid arguments in 40tude Dialog:
!markread,ignore From "Name" +""
[X] Watch/Ignore works on subthreads
Most of the search engines don't catalog eBay. I think eBay discourages that; they'd rather have their nonspecific "Get all your on eBay!" paid links pointing to their own search page.
(Of course, this can generate some humorous results, as when you search for things like "B-2 bomber name".)
[ ... ]
Here, children, you can have mine. It listed four current auctions:
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the most expensive of which was under $20, total.
Interesting stuff...
Gary
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Gary Heston gheston@hiwaay.net http://www.thebreastcancersite.com/
Yoko Onos\' former driver tried to extort $2M from her, threating to
"release embarassing recordings...". What, he has a copy of her album?
I find it odd that they made no mention of the radioactivity. Its best not to place this device anywhere near your lap, if you know what I mean.
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Paul Hovnanian mailto:Paul@Hovnanian.com
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Nondeterminism means never having to say you are wrong.
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