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110420 - Physics 122 Physics 122 1 Physics 122 2 Physics...

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Physics 122 4/20/11 Prof. E. F. Redish 1 4/20/11 1 Physics 122 4/20/11 2 Physics 122 4/20/11 5 Physics 122
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Physics 122 4/20/11 Prof. E. F. Redish 2 4/20/11 6 Physics 122 4/20/11 7 Physics 122 4/20/11 8 Physics 122 nuclei Shared electron cloud
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Physics 122 4/20/11 Prof. E. F. Redish 3 4/20/11 9 Physics 122 4/20/11 10 Physics 122 4/20/11 11 Physics 122 A P F ± ± = 1 2 3 4
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Physics 122 4/20/11 Prof. E. F. Redish 4 4/20/11 12 Physics 122 F drag = 8 π μ Lv 4/20/11 13 Flow in Flow out Pressure force upstream Pressure force downstream Drag force 4/20/11 14 Physics 122 P upstream ± A L P downstream ± A R ± F drag Δ P A = 8 π μ Lv Δ P A = 8 π μ L Q A Δ P = 8 π μ L A 2 Q = 8 μ L π R 4 Q Δ P = QZ Pressure drop = (Flow)(Resistance) Flow: Q = vol/sec = Av
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Physics 122 4/20/11 Prof. E. F. Redish 5 Constant flow of charge through a resistor. “Resistance” (energy produced – e.g. in lightbulb) Drag force on the electrons? Guess - bv Must be some kind of “pressure drop” corresponding to the electric force. 4/20/11 16 Physics 122 No resistance constant
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