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# Lecture 5 - Quiz 1 Is Friday Feb 5 4:30-5:45 CW101,102,103...

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Quiz 1 Is Friday, Feb. 5, 4:30-5:45, CW101,102,103. Covers material through today: electric charge, field, and force; Gauss’s Law. A review will be given tonight, Wednesday at 7:30PM in CW102. SAS Review: Thursday, 6:00-8:30pm, Paslay Auditorium. Reminder: ~half the quiz will be “problem solving” worked out an test sheets and half “conceptual” answered on scantron cards.

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Gauss’s Law test If the flux through a closed surface is zero, does that mean E=0 on the surface? A. Yes. B. No. If E=0 everywhere on a surface, does that mean that there can be no charge within the surface? A. Yes. B. No.
A long uniformly charged wire of radius R In this case the symmetry is cylindrical. The field must point away from the wire and its magnitude can only depend on the distance from the wire. Because the wire is very long, it is only sensible to specify the charge/length λ . We choose a cylinder of radius r and length L for our Gaussian surface. No flux goes through the cylinder

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