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Applications of Gauss' Law

Applications of Gauss' Law - Physics 202 Thursday February...

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Physics 202 Thursday February 4, 1999 Announcements: Quizzes on Friday and Monday will cover Chapters 23 and 24 Review Sessions for the first Midterm: Sunday February 7 2:30 to 4:00 103 Osmond Mr. Takemae 4:00 to 5:30 101 Osmond Mr. Wertz 6:00 to 7:30 101 Osmond Mr. Minnick Monday February 8 3:30 to 5:00 117 Osmond Mr. Nelson 6:00 to 7:30 101 Osmond Mr. Zadorozhny Extended Office Hours next week. Professor Samarth February 8 1:00 to 3:30 338 Davey Lab Professor Chan February 9 12:45 to 3:30 327 Davey Lab Lecture notes: Applications of Gauss' Law Cylindrical Symmetry dA and E are parallel The charge per unit area is λ . E is radially outward from the center; there is no component of E in the y direction ( no electric field comes out of the end caps ) Φ = I E (dot product) dA = E I dA = E (2 π r) h

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Gauss' Law says : Φ = (Amount of charge enclosed)/ ε o = λ h / ε o Therefore, (E)(2 π r h) = λ h / ε o E = λ / 2 π r ε o Compare this with problem # 33 in Chapter 23 Applying Gauss' Law to a Non Conducting Sheet
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