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# 1-4 - Create assignment 00224 Homework 4 Feb 12 at 7:38 pm...

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1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – fnd all choices be±ore answering. The due time is Central time. Potential Dif 25:02, highSchool, numeric, > 1 min, normal. 001 The work needed to carry a 1 C charge ±rom point A to point B is 10 J. Calculate the potential di²erence 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: Point Charge 25:05, trigonometry, numeric, > 1 min, nor- mal. 002 At distance r ±rom a point charge q , the elec- tric potential is 600 V and the magnitude o± the electric feld is 200 N / C. Determine the value o± q . Correct answer: 2 . 00277 × 10 - 7 C. Explanation: Let : k e = 8 . 98755 × 10 9 N · m 2 / C 2 , V = 600 V , and e = 200 N / C . E = k e q r 2 and V = k e q r , so that V E = r . The potential is V = k e q r = k e q V E = k e q E V q = V 2 k e E = (600 V) 2 (8 . 98755 × 10 9 N · m 2 / C 2 ) (200 N / C) = 2 . 00277 × 10 - 7 C . keywords: Four Charges on a Triangle 25:06, trigonometry, numeric, > 1 min, nor- mal. 003 Let ² 0 = 8 . 85419 × 10 - 12 C 2 / N / m 2 . An equilateral triangle with sides 54 m has charges +3 μ C, - 3 μ C, and - 9 . 7 μ C at its vertices and charge +19 . 4 μ C at the midpoint on its side between the vertices with charges +3 μ C and - 3 μ C, see the fgure below. 54 m 27 m 27 m +3 μ C - 3 μ C - 9 . 7 μ C P +19 . 4 μ C What is the magnitude o± the x -component o± the electric feld at P , the point ±orming a second equilateral triangle with +3 μ C and - 3 μ / C.

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1-4 - Create assignment 00224 Homework 4 Feb 12 at 7:38 pm...

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