Final Exam F2007 Potential Short Answer Questions-1

# Final Exam F2007 Potential Short Answer Questions-1 - Final...

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Final Exam: Potential Short Answer Questions PHY 110 (1) Your friend claims to have measured an attractive force between two positively charged spheres to be 12 N when they are 5 m apart. Your friend then claims that the force is 24 N when the spheres are 10 m apart. List and briefly describe three reasons why your friend’s claims must be wrong. One of your three points must be quantitative. 1. Coulombs law, the distance has to be squared 2. like charges repel each other 3. force decreases as the spheres move farther apart (2) Suppose you have two, identical socks that repel each other with a certain force. You move the socks so they are three times as far apart as they were originally, but the force between them stays the same. (A) How could the magnitude of the charges change so that the force remains constant and the socks remain identical? Provide a quantitative answer. (B) Now let the charges remain the same, and let the force decrease as you separate the socks. Does the potential energy of the system increase or decrease? Why?

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## This test prep was uploaded on 04/06/2008 for the course PHY 110 taught by Professor Levin during the Fall '07 term at Wake Forest.

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Final Exam F2007 Potential Short Answer Questions-1 - Final...

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