Phys 0175 - Lecture 27

Phys 0175 - Lecture 27 - Lecture 27 (Mar. 23, 2009):...

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Lecture 27 (Mar. 23, 2009): Induction and Inductance (cont’d): Induction and energy transfers Eddy currents Motional emf Illustrative examples
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Summary of previous lecture: cos B B dA B dA φ Φ = = r r g Magnetic flux: [SI units: T·m 2 = Wb] Induced emf = = B d dt Φ - E Faraday’s Law of Induction: Lenz’s Law: The induced current always has a direction such that the magnetic field due to the induced current opposes the change in the magnetic flux that induced it.
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Induction and energy transfers: 2 3 1 2 2 2 2 2 2 2 2 ; hence F= and F does work at the rate The induced current generates heat at the rate F F ixB F iLB BLv B L v P Fv iLBv LBv R R BLv B L v P i R R R R = - = = = = = = = = = r r Lenz’s Law implies that positive work must be done by an outside force F in order to produce an induced current. Thus Lenz’s Law is really an energy conservation law. Earlier we have seen that in this situation the
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This note was uploaded on 04/06/2009 for the course PHYS 0175 taught by Professor Koehler during the Spring '08 term at Pittsburgh.

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Phys 0175 - Lecture 27 - Lecture 27 (Mar. 23, 2009):...

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