p240_ct18_f07 - Physics 240 Fall 2007 Lecture #18 Dr. Dave...

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Physics 240 Fall 2007 Lecture #18 Dr. Dave Winn 2405 Randall Lab winn@umich.edu
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Exam #2 results Exam median 65%, average also around 65% Solutions for form #3 on the web
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1. Moving charges can experience forces in magnetic fields: F = qvBsin( θ ) 2. Moving charges produce magnetic fields 3. Changing magnetic fields produce electric fields Michael Faraday 1791- 1867
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Induced EMF Magnetic fields produced by currents discovered by accident Faraday set out to see if the reverse was true: could magnetic fields produce a current? Induction demo
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Basic observations: 1. A constant magnetic field induces no EMF 2. When the B field through the loop increases, the EMF increases. When the B field descreases, the EMF is reversed . 3. The magnitude of the induced EMF is proportional to how fast the B field is changing 4. When there are many loops, total EMF produced increases 5. Stronger magnets produce a larger EMF (size of the B field matters)
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p240_ct18_f07 - Physics 240 Fall 2007 Lecture #18 Dr. Dave...

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