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Lec-14 - Previous Lecture Magnetic domains in iron...

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Previous Lecture Magnetic domains in iron Hysteresis Types of magnetism (ferro-, para-, dia-) October 15, 2007 – p.
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Today: Faraday’s Law – p.
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Today: Faraday’s Law and related topics: finish Paramagnetism Diamagnetism Lenz’ Law – p.
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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.
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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.
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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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