ch23_p20 - 20. We imagine a cylindrical Gaussian surface A...

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20. We imagine a cylindrical Gaussian surface A of radius r and unit length concentric with the metal tube. Then by symmetry enc 0 2. A q EdA rE ε ⋅= π = ³ G G v (a) For r < R, q enc = 0, so E = 0. (b) For r > R, q enc = λ , so 0 () /2 . Er r πε With 8 2.00 10 C/m λ and r = 2.00 R 0.0600 m, we obtain 8 3 12 2 2 2.0 10 C/m 5.99 10 N/C.
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This note was uploaded on 01/25/2011 for the course PHYSICS 17029 taught by Professor Rebello,nobels during the Spring '10 term at Kansas State University.

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