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Homework 3 - Physics 118A PROBLEM SET#3 Assigned Wed Young...

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Physics 118A PROBLEM SET #3 Assigned: Wed. . 1/30/08 Due Thur. 2/7/08 no later than 5:00 PM Practice problems, not turned in: 23.23, 23.41, 23.79, 24.13, 24,15, 24.47 While we encourage free discussion of the homework, each assignment is to be completed individually. BOX YOUR FINAL ANSWERS. 1. Two equal point charges q are located on the x axis at x = a and x = - a . a) Calculate the electric potential V for an arbitrary point on the y axis. (Take V = 0 infinitely far from the charges.) b) Use the result of part (a) to calculate the E y the y component of the electric field for an arbitrary point on the y axis. c) Explain in one or two sentences why you cannot use the result of part (a) to calculate E x along the y axis. (In fact from the symmetry of the problem, you can easily say that E x must be zero along that axis, but you cannot use the solution of part (a) to prove that.) 2. Two large parallel conducting plates carry opposite charges of equal magnitude with
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