2013%2BW%2B314%2BHW%2B2%2Bans

Gentleman was wearing silk stockings if he were

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Unformatted text preview: cotton socks, there would be no spark. 8. The sparks would probably get larger if – instead of silk – the gentleman were wearing wool socks or stockings. 9. To avoid or reduce sparks between their bodies, you would use an air ionizer. 10. It is important that the gentleman has his body suspended: if he were standing on the same carpet with the lady, there would be no sparks whatsoever (assume that the carpet is insulating). 11. There would be no sparks if the gentleman were lying on a copper plate instead of the wooden board. 12. No matter what the material of the board was used, the main thing is that the suspending ropes must be not conducting: suspend him with wires – and there will be no sparks whatsoever! © 2013 EECS 314 Instructors EECS 314 Winter 2013 HW 2 Solution 13. Neither the material of the board nor the materials of the suspensions are of any importance: the main thing is whether the hook, which holds everything, was grounded: ground the hook – and the public will be disappointed, because there would be no sparks no matter what the experimentalists do. 14. If everything were made of cotton – all of their clothes and footwear, the ball, the board (or hammock) and the suspending ropes, the carpet, etc., there would be no sparks whatsoever. 15. If, instead of a lady’s finger, the gentleman would bring his nose near a modern circuit board with MOSFETs, etc., this could cause irreparable damage to some of the electronic components. A) The discharge (spark) takes place only between objects whose electric potentials are very different. B) Having one object grounded does not ensure that other objects also have zero potential. C) Except deliberate rubbing with the rotating ball, there may be other ways of accumulating electric charge on one’s body. Important hints: Keep in mind that the answers provided in the table above are not the only correct answers. In fact, for every scenario of each statement, there might be more than one answer that makes sense. As long as the students provide some explanation for answers that might be in doubt, points should be granted even if the answers are different from the ones provided above. Some extra notes: Comment This problem is very different from many others in this course, because it confronts you with a real-world situation, in which it might be unclear, where the sources of charges were, where were the conductors, etc. It is not unusual to see some answers as “Not enough information” or disagree with your classmates. Think about a heated discussion that might happen in court where several experts were called to testify on what exactly caused death in an industrial setting: their conclusions may agree on some points and disagree on others… © 2013 EECS 314 Instructors EECS 314 Winter 2013 Part 2 (20 points) HW 2 Solution Getting ready to work with sensitive electronic equipment, you should know how to eliminate not only spectacular sparks, but all undesirable voltages. Apply your knowledge...
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This note was uploaded on 09/30/2013 for the course EECS 314 taught by Professor Ganago during the Winter '07 term at University of Michigan.

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