Magnetismchp36 - Magnetism • Electricity and Magnetism are related • Discovery(by Hans Oersted in 1827 An electric current causes a compass nee

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Unformatted text preview: Magnetism • Electricity and Magnetism are related. • Discovery: (by Hans Oersted in 1827): An electric current causes a compass nee- dle to deflect . 1. The current has caused a magnetic field . 2. The compass needle points in the direc- tion of this magnetic field. 3. The compass needle is a magnet: – Its north pole points in the direction of the magnetic field. – The direction of the current and the direction of the magnetic field are re- lated by a ”right-hand rule”. 1 Magnetic Poles 1. Magnetic ”poles” produce magnetic forces. 2. All magnets have a ”north” and ”south” pole. Examples: (a) bar magnet (b) horseshoe magnet (c) natural magnet: lodestone 3. Like poles repel; unlike poles attract. 4. A magnet must have two poles: (a) A magnetic pole cannot exist by itself. (b) If you break a magnet, you will have two magnets, each with its own two poles. 2 Magnetic Materials Electrons were found to have a magnetic field associated with them. This led to the discovery of electron spin (1920’s). Magnetism in materials is caused by elec- tron spin : • The spin of an electron is a measure of its intrinsic angular momentum . The spin and magnetic field are in the same direction ....
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This note was uploaded on 10/19/2011 for the course PHY 2020 taught by Professor Staff during the Spring '08 term at University of Florida.

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Magnetismchp36 - Magnetism • Electricity and Magnetism are related • Discovery(by Hans Oersted in 1827 An electric current causes a compass nee

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