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Unformatted text preview: Create assignment, 00224, Homework 4, Feb 17 at 10:45 am 1 This printout should have 12 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. The due time is Central time. Potential Diff 25:02, highSchool, numeric, > 1 min, normal. 001 The work needed to carry a 1 C charge from point A to point B is 10 J. Calculate the potential difference between point A and B. Correct answer: 10 V. Explanation: Let : q = 1 C and W = 10 J . The work is W = q V V = W q = 10 J 1 C = 10 V . keywords: Proton in Potential Diff 25:05, trigonometry, numeric, > 1 min, nor mal. 002 Calculate the speed of a proton that is acceler ated from rest through a potential difference of 120 V. Correct answer: 151622 m / s. Explanation: Let : m p = 1 . 67262 10 27 kg , q = 1 . 60218 10 19 C , and V = 120 V . By conservation of energy K + q V = 0 , 1 2 mv 2 = q V v p = s 2 q V m p = s 2 (1 . 60218 10 19 C) (120 V) 1 . 67262 10 27 kg = 151622 m / s . The only difference in the speed of the pro ton and the speed of the electron is the differ ence in their mass. 003 Calculate the speed of an electron that is accelerated through the same potential differ ence. Correct answer: 6 . 49705 10 6 m / s. Explanation: Let : m e = 9 . 10939 10 31 kg . The speed is v e = r 2 q V m e = s 2 (1 . 60218 10 19 C) (120 V) 9 . 10939 10 31 kg = 6 . 49705 10 6 m / s . keywords: Three Point Charges 13 25:06, trigonometry, numeric, > 1 min, nor mal. 004 Three equal charges 2 . 5 C are located in the xyplane, one at (0 m, 45 m), another at (55 m, 0 m), and the third at (65 m, 35 m)....
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 Spring '10
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