p240_ct20_f07 - Physics 240 Fall 2007 Lecture #20 Dr. Dave...

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Physics 240 Fall 2007 Lecture #20 Dr. Dave Winn 2405 Randall Lab [email protected]
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Maxwell’s Equations, a Brief Interlude… enc E B enclosed I dt d s d B dt d s d E A d B q A d E 0 0 0 0 0 μ εμ ε + Φ = Φ = = = r r r r r r r r Fq E q v B = r rr r
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James Clerk Maxwell Scottish physicist: 1831- 1879 Huge impact on theoretical physics: Thermodynamics Electricity and Magnetism Physics of Fluids and viscosity Color theory Rings of Saturn Died of cancer at 48 Max the Parrot (2005--)
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Maxwell’s “Treatise on Electricity and Magnetism” Maxwell sought to encode Faraday’s ideas of fields an fluxes in proper mathematical form Building on Faraday, Ampere, etc. Realized another basic rule must apply: Changing electric fields produce magnetic fields! Take a step back to see why…
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An old problem swept under the rug… Charging capacitor: at first it acts like a wire, current “passes through it”, but what does that mean? The “current” through this capacitor is related to the change in electric flux inside the capacitor: changing Φ E acts like a current!
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This note was uploaded on 04/04/2008 for the course PHYSICS 240 taught by Professor Davewinn during the Fall '08 term at University of Michigan.

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p240_ct20_f07 - Physics 240 Fall 2007 Lecture #20 Dr. Dave...

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