More on Gauss' Law - Physics 202 Tuesday February 2 1999...

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Physics 202 Tuesday, February 2, 1999 Announcements: Sample exams are available on the class web page . Review sessions for Tuesday's exam will be announced in class on Thursday. You will be allowed to use one sheet of 8 1/2" by 11" paper during the exam. Be sure to include any equations or constants you may need to use. Use of calculators on the exam is permitted and be sure to bring a pencil. Lecture notes: More on Gauss' Law What if the surface is curved and the electric field is not constant? Then ∆Φ = E i x A i ; Φ = Σ E i x A i = lim ( A i approaches 0) E i x A i = Ι E i x A i I is the integral symbol Gauss' Law The net electric field flux, Φ , through a closed surface is proportional to the net charge enclosed by the surface. Φ = q/ ε o Example: The net electric flux through each surface is the same.
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In the following situation, the net flux is zero. Example: Problem 6 from text The charges on a neutral isolated conductor is separated by a nearby positively charged rod. What is the net flux through each of the five gaussian (closed) surfaces?
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