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fa10test2

# fa10test2 - Name Instructor Louisiana State University...

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Name: _______________________ Instructor:__________________ Louisiana State University Physics 2102, Exam 2, October 14, 2010. Please be sure to write your name and class instructor above. The test consists of 3 questions (multiple choice), and 4 problems (numerical). All numerical quantities must have appropriate units. Points will be deducted if units are absent. For the problems: Show your reasoning and your work – no credit will be given for an answer without explanation or work . Note that in many of the problems, you can do parts (b) or (c) even if you get stuck on (a) or (b). You may use scientific or graphing calculators. Cell phones cannot be used as calculators. Feel free to detach, use, and keep the formula sheet pages. No other reference material is allowed during the exam. Good Luck!

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Problem 1 [15 points] The saw in the figure has a net charge on it of +700 pC. The metric crescent wrench has a net charge of 700 pC. A voltmeter is connected from the wrench to the saw in order to measure the potential difference (275 V) between the two tools. (a) [5 pts] Calculate the capacitance of this arrangement of the two tools. (b) [7 pts] Suppose you used insulating gloves (so that no charge can escape) and moved the wrench to a new position so that the voltmeter now reads twice as great a voltage (550 volts). Calculate the work
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fa10test2 - Name Instructor Louisiana State University...

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