PRACTICEFINAL2 - Final Exam 13303 Spring 2004 Dr Abramzon...

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Final Exam 13303 - Spring 2004 / Dr. Abramzon Name Instructions: Closed book – you may use ONE 8”x11” sheet with formulas Read each problem carefully. There are 7 problems, worth a total of 50 points. There is one bonus problem worth an additional 5 points. It is critical that you show all of your work - don't just write down answers Please turn in your formula sheet at the end of the exam Good luck! Problem 1 ( 5 points)___________ Problem 2 ( 7 points) ___________ Problem 3 ( 8 points) ___________ Problem 4 ( 9 points) ___________ Problem 5 ( 6 points) ___________ Problem 6 ( 8 points) ___________ Problem 7 ( 7 points) ___________ Bonus Problem ( 5 points) ___________ Total :
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1) A copper rod 0.150m long with mass of 0.05kg is suspended from 2 thin flexible wires. At right angles to the rod is a uniform magnetic field of 0.550T pointing into the page. a) (3 points.) Find the magnitude of the electric current needed to levitate the cooper rod. b) ( 2 points) Find the direction of the electric current needed to levitate the cooper rod.
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