# Lect03 - Physics 212 Lecture 3 Today's Concepts Electric...

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Physics 212 Lecture 3, Slide 1 Physics 212 Lecture 3 Today's Concepts: Electric Flux and Field Lines Gauss’s Law

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Music Who is the Artist? A) Eric Clapton B) Bill Frisell C) Jimmy Page D) Jeff Beck E) Buddy Guy Why? Maybe Someone Less Obscure?? Also, my vote for most memorable performance at New Orleans Jazzfest by a big name! Somewhere over the Rainbow People Get Ready Amazing…. Physics 212 Lecture 3
Physics 212 Lecture 3, Slide 3 Your Comments “Where did "epsilon not" come from and what is its value?.” 04 2 ˆ q E k r r = arrowrightnosp 2 0 1 ˆ 4 q E r r πε = arrowrightnosp k = 9 x 10 9 N m 2 / C 2 ε 0 = 8.85 x 10 -12 C 2 / N m 2 IT’S JUST A CONSTANT ! “I always understand the material so much better after the lectures and especially the clicker questions” That’s what we hope happens!! “What is the difference between E times A and E "dot" A?” VECTORS: dot product ! “Will we ever be expected to take surface integrals, and if so can you discuss them in a little more depth?” “Are we going to actually use calculus now?” “Why is there a specific number of lines coming from a particle? Aren't electric fields radial, so wouldn't the lines be infinite?” Field lines are a REPRESENTATION ! You can choose number of lines produced by 1 Coulomb. YOU BET! Integrals will be easy to evaluate, though.. We will use Gauss’ law next time to calculate E fields !! “It's my friend Ben Wallace's birthday tomorrow during the Tuesday lecture! Can you put it on the board for me please?”

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Physics 212 Lecture 3, Slide 4 My Comments You will need to understand integrals in this course!!! Forces and Fields are Vectors Always Draw a Picture First… What do the Forces/Fields Look Like? Prelecture Infinite line of charge E Lecture Finite line of charge (constant λ ) E Worked Example Finite line of charge (non-constant λ ) E Homework Arc of charge (constant λ ) E 2 2 0 1 ˆ ˆ 4 dq dq E k r r r r πε = = arrowrightnosp WORKS FOR ALL !! “The 1/4 shell problem on the homework was not explained extensively enough in the smart physicsbook.” The “1/4 shell problem” is not special !!
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