# Lect04 - Physics 212 Lecture 4 Today's Concepts Conductors...

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Physics 212 Lecture 4, Slide 1 Physics 212 Lecture 4 Today's Concepts: Conductors + Using Gauss’ Law

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Physics 212 Lecture 4 Music Who is the Artist? A) Marc Ribot B) Bill Frisell C) Richard Thompson D) Pat Metheny E) John Scofield Why?? I think he is my favorite jazz guitarist !! He also is coming to Ellnora (as are two of the others) !!
Physics 212 Lecture 4, Slide 3 Your Comments “ABSOLUTELY POSITIVELY 100% CONFUSED!! I don't understand the conductors and how that affects the E field and i REALLY do not understand the solid cylindrical conductor part AT ALL! Help!!“ 04 “I don't understand Gaussian surfaces” Most students are having difficulties with this topic: The Checkpoints show this clearly. This whole way of thinking (Gauss’ Law) is very unfamiliar to you: calculate a field means, first, pick a surface?? The solution? DON’T PANIC… We’re confident you will master these concepts but it will take a little work. “Wow ..... just wow” Our Response TODAY’S PLAN: Do Checkpoints again! Try to understand the reasoning Do a calculation using Gauss’ Law “If my charge was related to my understanding of this material, I would be negative.” “Gauss' Law is very confusing. I do not fully understand how to find the electic field using this law. I follow the examples but the problems don't seem to work for me.”

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Physics 212 Lecture 4, Slide 4 Conductors = charges free to move Claim: E = 0 inside any conductor at equilibrium Charges in conductor move to make E field zero inside. (Induced charge distribution). If E <>0, then charge feels force and moves! Claim: Excess charge on conductor only on surface at equilibrium Why? • Apply Gauss’ Law • Take Gaussian surface to be just inside conductor surface E = 0 SIMULATION 2 06 • E = 0 everywhere inside conductor = o enc Q A d E ε arrowrightnosp harpoonrightnosp • Gauss’ Law: 0 enc Q = = o enc Q A d E ε arrowrightnosp harpoonrightnosp
Physics 212 Lecture 4, Slide 5 Gauss’ Law + Conductors + Induced Charges ALWAYS TRUE!

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