Magnets are among the first forces of nature, detected by humans. Its history goes back to the fourth century BC, when Chinese literature to the attraction between iron and magnetic media. Magnetite is a natural magnet, ie, creates its own magnetic field, which is what attracts iron "induced" magnet is magnetized temporarily, when it comes into contact with permanent magnets. A ferrofluid is a liquid magnet induces the liquid in the presence of a magnetic field is magnetized.

2011-03-16

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