Lect_13_note

Lect_13_note - Chapter 29 - 1 Magnetic Fields A Brief...

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Chapter 29 - 1 Magnetic Fields
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A Brief History of Magnetism ± The first definite statement is by Greek philosopher Thales of Miletus (about 585B.C.) who said loadstone (Fe 3 O 4 ), attracts iron because it has a soul.
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A Brief History of Magnetism ± In China, the earliest literary reference to magnetism lies in a 4th century BC book called Book of the Devil Valley Master ( 鬼谷子 ): "The lodestone makes iron come or it attracts it."
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A Brief History of Magnetism ± 1086, Chinese astronomer and mathematician Shen Kuo (沈括) reports the use of magnetic compasses for navigation in Meng Xi Bi Tan (“Dream Pool Essays”) (孟溪笔谈) .
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A Brief History of Magnetism ± 1269, Pierre de Maricourt found that the direction of a needle near a spherical natural magnet formed lines that encircled the sphere. The lines also passed through two points diametrically opposed to each other. He called the points poles
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A Brief History of Magnetism English physician and natural philosopher ± 1600, William Gilbert ± Expanded experiments with magnetism to a variety of materials ± Suggested the Earth itself was a large permanent magnet
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A Brief History of Magnetism Danish physicist and chemist ± 1819, Hans Christian Oersted discovered an electric current in a wire deflected a nearby compass needle
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A Brief History of Magnetism ± 1820’s ±
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Lect_13_note - Chapter 29 - 1 Magnetic Fields A Brief...

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