Lec-14 - Previous Lecture • Magnetic domains in iron • Hysteresis • Types of magnetism(ferro para dia – p Today Faraday’s Law – p Today

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Unformatted text preview: Previous Lecture • Magnetic domains in iron • Hysteresis • Types of magnetism (ferro-, para-, dia-) October 15, 2007 – p. Today: Faraday’s Law – p. Today: Faraday’s Law and related topics: • finish Paramagnetism • Diamagnetism • Lenz’ Law – p. Paramagnetism The molecules in a paramagnetic material have a permanent magnetic moment μ . An external field B exerts a torque that tends to line up all the moments. The effect is small since the molecules can’t move much, but the magnetic field of the aligned moments adds to the external field. – p. Diamagnetism The molecules in a diamagnetic material have no permanent magnetic moment. An external field B induces a net magnetic moment in each molecule that opposes the external field. – p. Faraday’s Law: Motivation Faraday (1791–1867) searched for a relation between E and B . Since an constant electric field makes a charge move, causing a magnetic field, he wondered if a constant magnetic field acting on a charge could lead to an electric field....
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This note was uploaded on 02/29/2008 for the course PHYSICS 21 taught by Professor Hickman during the Spring '08 term at Lehigh University .

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Lec-14 - Previous Lecture • Magnetic domains in iron • Hysteresis • Types of magnetism(ferro para dia – p Today Faraday’s Law – p Today

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