HW6 - Platt, David Homework 6 Due: Sep 19 2005, 4:00 am...

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Unformatted text preview: Platt, David Homework 6 Due: Sep 19 2005, 4:00 am Inst: Ken Shih 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. Note: Please give your answer for 003 in unit of eV (electron volt). 001 (part 1 of 1) 10 points Four charges are placed at the corners of a square, where q is positive ( q > 0). There is no charge in the center of the square. Q 4 =- q Q 1 =- q Q 3 = + q Q 2 = + q a The magnitude of the total electrostatic energy of the system is given by 1. U = 4 k e q 2 a . 2. U = 2 k e q 2 a 2 . 3. U = 4 k e q 2 a 2 . 4. U = 2 k e q 2 a . 5. U = 8 k e q 2 a 2 . 6. U = 4 2 k e q 2 a . 7. U = 2 k e q 2 a 2 . 8. U = 2 2 k e q 2 a 2 . 9. U = 2 k e q 2 a . 10. U = 4 2 k e q 2 a 2 . 002 (part 1 of 2) 10 points A voltage of 9 V is applied across the ends of a piece of copper wire 9 cm long. The mass of an electron is 9 . 11 10- 31 kg and its charge...
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HW6 - Platt, David Homework 6 Due: Sep 19 2005, 4:00 am...

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