The Physics Front 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.
This site features explanations and experiments designed around a series of increasingly more complex issues of magnetism from "What is magnetism?" to "Build your own Gaussmeter" (a device that measures the strength of a magnet).
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A related interactive simulation that explores the relationship between a bar magnet and a compass. Users can add a field meter or superimpose the planet Earth on the bar magnet to see the orientation of the magnetic poles.