|MadSci Network: Chemistry|
One of my friends claimed that he did an experiment and found that graphite was slightly magnetic. I didn't believe him, but after reading about paramagnetism and diamagentism, I decided to do an experiment as well. Using 0.5 mm "lead" for mechanical pencils, I balanced a piece carefully over the edge of a book and applied a magnetic field consisting of 54 "Geomag" magnets. As I moved it closer, the graphite suddenly moved away from the magnet (I tried the other pole of the magnet and it was also repelled). I concluded that graphite was diamagnetic. This was, in fact, what I had expected, since pyrolitic carbon is diamagnetic. I then decided to sharpen a HB pencil, again balance it carefully over a book, and apply a magnetic field. To my surprise, it moved closer to the magnet (again, I tried both poles). What could possibly explain this?
Re: Strange magnetism of graphite
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