P213Prelim2Fall2007

P213Prelim2Fall2007 - Physics 213 Your Name Recitation...

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Physics 213 PRELIM #2 (11/06/07) Fall 2007 Your Name: Recitation Section #: Recitation Instructor: Instructions : Please write your name, recitation section number, and recitation instructor at the top. There are 9 problems in this exam. The total number of points is 100. Make sure that your copy is complete (11 numbered pages) before starting. The exam is closed book. No graphing calculators are allowed! The last page of the exam contains formulae that you may find useful. Your answers must be written in the box provided in each problem. If the answers are in numbers, please provide SI units . Show your work for possible partial credit on problems 6-9. Two blank pages are attached near the end of the exam. They may be used for scratch paper, but will not be graded, unless you clearly refer us to some item there. Problem Points Grader Your Score 1 10 2 9 3 10 4-5 9 6 8 7 22 8 16 9 16 TOTAL 100
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2 1. True/False [10 points, no partial credit] Mark T (True) or F (False) in the space at the right of each statement. NOTE: You should mark a statement TRUE only if it is always true . (a) As the temperature of a metal wire is increased, its resistance decreases because its electrons move more rapidly in their thermal motions. (b) An electron in a conductor can never feel an electric force. (c) As current passes through the filament of a light bulb, electrons are converted into heat and light. (d) The voltage drop around a closed loop in a circuit can be nonzero provided this loop involves a capacitor. (e) A positively charged object cannot feel an electric force from a neutral object. (f) If a region of space contains no charges, the electric field must be zero everywhere on the boundary of this region. (g) If the electric field is zero throughout some region of space, the electric potential has the same value everywhere in this region. (h) An electron placed between the plates of a charged parallel-plate capacitor cannot move in a straight line.
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