FINAL_F08_final

FINAL_F08_final - Physics 213 Your Name: Recitation Section...

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Physics 213 FINAL EXAM (12/12/08) Fall 2008 Your Name: Recitation Section #: Recitation Instructor: Instructions : Please write your name, recitation section number, and recitation instructor at the top. There are 11 problems in this exam. The total number of points is 100. Make sure that your copy is complete (17 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 space provided in each problem. If the answers are in numbers, please provide SI units . Show your work for possible partial credit on problems 7-11. 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 Your Score Grader 1 10 2-3 9 4 8 5-6 9 7 10 8 13 9 11 10 13 11 17 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. (a) The net magnetic flux through any closed surface is always zero. (b) A time-varying electric field can give rise to magnetic field, even if no electric currents are present. (c) A current-carrying wire loop whose plane is perpendicular to a uniform magnetic field experiences zero net force but a non-zero torque. (d) Electric field lines cannot form closed loops. (e) In a series LCR circuit driven by sinusoidal voltage, the amplitude of the voltage across the resistor cannot be greater than the amplitude of the source’s voltage. (f) A loop of wire rotating with constant angular speed in a constant uniform magnetic field generates DC current. (g) Magnetic fields never exert forces on objects with no net electric charge. (h) The units of H F are equivalent to seconds. (j) The amplitude of the voltage oscillations in the standard household AC electrical outlets in North America is 120 V. (k) If an initially empty solenoid is filled with material, the inductance of the solenoid will always increase, no matter what material is used.
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3 2-6. SHORT ANSWER [26 points] Write your answers in the spaces provided. 2. [3 points] A small bar magnet is moving at a constant speed in the +x direction, passing through the center of an aluminum ring suspended on a string in the plane perpendicular to the bar magnet’s trajectory. As the magnet passes through the ring, the force experienced by the ring is: (A) In the +x direction, whenever it’s non-zero (B) In the -x direction, whenever it’s non-zero (C) First in the +x direction, then in the –x direction (D) First in the -x direction, then in the +x direction (E) Always zero Answer: 3. [6 points] Two circular wire loops #1 and #2 situated directly above one another carry electric currents I 1 and I 2 in the same sense, as shown. (As seen from the top, both currents circulate counterclockwise.) (a)
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This note was uploaded on 12/25/2009 for the course PHYS 213 at Cornell.

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FINAL_F08_final - Physics 213 Your Name: Recitation Section...

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