Lecture 5 - Quiz 1 Is Friday, Feb. 3, 4:30-5:45,...

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Quiz 1 Is Friday, Feb. 3, 4:30-5:45, CW101,102,103. Covers material through Wednesday: electric charge, field, and force; Gauss’s Law. A review will be given Wednesday evening at 7:30PM in CW102. 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 for the Electric Field The electric field flux through any closed surface equals the electric charge enclosed by the surface. If a surface encloses no charge, then F E =0 through the surface. The integral with the circle through it reminds us that the integral is to be done only on closed surfaces. Gauss’s Law “works” because, through a fixed solid angle DW , the area subtended by DW grows as r 2 while the field pointing into DW shrinks as 1/r 2 . 0 enc q A d E
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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.
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This note was uploaded on 02/01/2012 for the course PHYS 214 taught by Professor Law during the Spring '08 term at Kansas State University.

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Lecture 5 - Quiz 1 Is Friday, Feb. 3, 4:30-5:45,...

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