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MAGNETISM l Historical background : lodestone (magnetite) known for 1000s of years; Thales of Miletus studied lodestones (590 BC); magnetic compass invented.

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1 MAGNETISM l Historical background : lodestone (magnetite) known for 1000s of years; Thales of Miletus studied lodestones (590 BC); magnetic compass invented by Chinese around 200 AD; Pierre de Maricourt a.k.a. Petrus Peregrinus (1269) studied magnets, Earth's magnetism; concept of poles, tried to isolate single pole; William Gilbert (1544-1603) (court physician of Elizabeth I and James I)  first serious studies of magnets  two “poles” of magnets  Earth is a magnet  iron can be magnetized  magnetism destroyed by heating Hans Christian Oersted (1777-1851)  electric current generates magnetic field (1820) l Essentials of magnetism: every magnet has two poles - “dipole''-- there are no magnetic monopoles like poles repel each other, unlike poles attract magnetic field:  magnetic forces due to “magnetic field” (Faraday), caused by magnet in its surrounding  magnetic field lines describe direction, density of lines represents magnitude of field;  field due to one pole obeys “Coulomb-like” law, total field of magnetic dipole = superposition of the two fields  moving charges (currents) generate magnetic fields

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