Magnetism is a force which attracts oppositely magnetized objects to each other, and repels similarly magnetized objects from each other. Every electron is a tiny magnet, but in most materials, the spins of the electrons cancel each other out. In magnetic materials, the electrons can spin in the same direction and create a magnetic field.University of Birmingham: History of Magnetism
History of Magnetism
- 800 BC: Lodestone's attractive power known in China and Europe
- 1000s: Small pieces of iron used in compasses in China
- 1820: Danish scientist Hans-Christian Oersted discovers connection between electricity and magnetism
- 1898: First magnetic recording device developed by Danish engineer Valdemar Poulsen
- 1900s: Permanent magnets developed
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References
Fast Facts
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Magnetic fields always paired, with equal and opposite "north" and "south" polesNondestructive Testing (NDT) Resource Center: Magnetism
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Opposite poles attract while like poles repel
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Ferromagnetism causes most magnetic behaviorNondestructive Testing (NDT) Resource Center: Magnetism
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Ferromagnetic materials include iron, nickel and cobalt
