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Unformatted text preview: f = k e Q 2 e x 4 a 2 ln & b 2 b 2 & 4 a 2 is the electric force on the righthand rod due to the lefthand rod. 4. Serway & Jewett Problem 23 : 53 . A line of positive charge is formed into a semicircle of radius R = 60 : cm as shown in Figure P 23 : 53 . The linear charge density is given by = cos , where is a constant. The total charge on the semicircle is +12 : & C . Calculate the electric force on a point charge of +3 : 00 & C placed at the center of curvature. 5. Serway & Jewett Problem 23 : 65 . A line of charge starts at x = + x and extends to positive innity. The linear charge density is given by = x =x , where is a constant. Determine the electric eld at the origin. 1...
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 Spring '09
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