The Physics To Go website will be unavailable Friday evening through Saturday afternoon as electrical work occurs in the American Center of Physics server room. Down time will begin at 6PM Eastern Time on Friday. Service is expected to resume by 6PM on Saturday, July 30.
Can a magnet exert a force on a grape? Find out with this Exploratorium activity. You'll see how to mount two grapes on a straw, so the tiny diamagnetic force produces observable motion. The site also contains an explanation of the physics involved and descriptions of ferromagnetic and paramagnetic materials.
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