nagle_phys2020_fa07_lecture14

# nagle_phys2020_fa07_lecture14 - Exam scores are now...

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1 46 • Exam scores are now available on CULearn. • If you believe there is a problem with your score, please come and see me next week (see below). • CAPA #5 due today. • CAPA #6 now available. • I will be out of town Monday/Tuesday next week, thus Professor Kapteyn will give the lecture on Monday. 47 Very large dielectric constant ? 48 49 Analog between a battery and an escalator. --------------------- +++++++++++++ + + + Δ V bat 50 Charging up a capacitor… 51 We have alluded to charges moving already. Electrons can flow along inside a metal if there is an electric field inside the wire to push them along. Push from Didn’t we say |E| = 0 in a metal? Not precisely. Metals in electrostatic equilibrium Æ |E| = 0 E e E q F v v v = =

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2 52 Electric Current = = Δ Δ = dt dQ t Q i I Rate of flow of charge Units [i] = Coulombs/second = Ampere (A) or “Amp” 53 Electrons flow in metals, not the protons, so the negative electric charges are moving. -e
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## This note was uploaded on 02/27/2008 for the course PHYS 2020 taught by Professor Dubson during the Fall '06 term at Colorado.

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nagle_phys2020_fa07_lecture14 - Exam scores are now...

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