Lect02 - Physics 212 Lecture 2, Slide 1 Physics 212 Lecture...

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Unformatted text preview: Physics 212 Lecture 2, Slide 1 Physics 212 Lecture 2 Today's Concept: The Electric Field Continuous Charge Distributions Music Who is the Artist? A) Bill Frisell B) Cindy Cashdollar C) Daniel Lanois D) Marc Ribot E) Tony Rice Why? Shes coming to Krannert Center for the Ellnora Guitar Festival!! As a matter of fact, all of the chices will be at Ellnora !!! Physics 212 Lecture 2 Our Comments 1. If your TA doesnt show up go to 231/3 (undergrad office) or home page for telephone numbers of discussion and lab masters (see also email from yesterday) 2. Please operate only your own clicker 3. Unfortunately we really cant help with PreLecture, Checkpoint or homework questions by email too many students: Office Hours, your friends 4. Dont panic! Physics 212 Lecture 2, Slide 3 Physics 212 Lecture 2, Slide 4 Your Comments The concept of infinite line of charge is difficult, especially with the complex integrals. I'm sort of lost with all of this... Are the points on an electric field positive or negative? How do you know when a point moves towards the dipole and when it doesn't move towards the dipole? I am so confused about these. Please go over them in lecture. THANK YOU! the two lines of charge checkpoint confused me Could you please go over the third checkpoint question. I was confused on how to get the correct formula! 04 Can you elaborate on the creation of electric fields. Does a charge create an electric field on a point? I just don't know how to word everything Can we go over homework problems in class? I find a lot of these concepts difficult, but I think they will make more sense once I practice problems with them. See example problem at end of lecture Well go over the CheckPoints Whats an electric field? Physics 212 Lecture 2, Slide 5 33 q 1 q 2 q 3 q 4 F 2,1 F 3,1 F 4,1 F 1 F 2,1 F 3,1 F 4,1 F 1 F 2,1 F 3,1 F 4,1 F 1 F 2,1 F 3,1 F 4,1 F 1 q 1 q 2 q 3 q 4 Coulombs Law (from last time) If there are more than two charges present, the total force on any given charge is just the vector sum of the forces due to each of the other charges: +q 1-> -q 1 f direction reversed 1 F a MATH: 1 3 1 2 1 4 12 13 14 2 2 2 12 13 14 = + + kq q kq q kq q r r r r r r 3 1 2 4 12 13 14 2 2 2 1 12 13 14 = + + a kq F kq kq r r r q r r r 1 E h Physics 212 Lecture 2, Slide 6 Electric Field The electric field E at a point in space is simply the force per unit charge at that point....
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Lect02 - Physics 212 Lecture 2, Slide 1 Physics 212 Lecture...

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