FINAL_F07 - Physics 213 Your Name: Recitation Section #:...

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Physics 213 FINAL EXAM (12/11/07) Fall 2007 Your Name: Recitation Section #: Recitation Instructor: Instructions : Please write your name, recitation section number, and recitation instructor at the top. There are 12 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 box provided in each problem. If the answers are in numbers, please provide SI units . Show your work for possible partial credit on problems 7-12. 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 7 4-5 12 6 6 7 10 8 12 9 12 10 11 11 10 12 10 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) Net magnetic flux through a closed surface is always zero. (b) A time-dependent current flowing through an infinitely long solenoid creates an electric field outside of the solenoid. (c) Electric and magnetic fields in a traveling electromagnetic wave are parallel to each other. (d) Electric field lines can 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) If suitable electric and magnetic fields are present, a charged particle can move along a straight line perpendicular to the magnetic field direction. (h) If an iron core is inserted into an (originally empty) cylindrical solenoid connected in series with a resistor, the time constant of this circuit increases. (j) The amplitude of the voltage oscillations in the standard household AC electrical outlets in North America is 120 V. (k) A current-carrying flat closed loop of wire oriented perpendicular to a uniform magnetic field experiences no net magnetic force.
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3 2-6. SHORT ANSWER [25 points] Write your answers in the spaces provided. 2. [4 points] A negatively charged particle -q is moving with velocity v directed into the page in a uniform magnetic field B whose field lines are parallel to the page at the angle θ , as shown. (a) (2 points) What is the magnitude of the magnetic force acting on the particle? (A) 0
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FINAL_F07 - Physics 213 Your Name: Recitation Section #:...

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