P213FinalExam2006

P213FinalExam2006 - Physics 213 Practice Final Fall 2007...

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Physics 213 Practice Final Fall 2007 page 1 of 13 Your Name: Section Number: Section Instructor: Problem Points Your Score 1 10 2 3 3 3 4 7 5 2 6 2 7 5 8 6 9 12 10 10 11 26 12 14 TOTAL 100 Instructions : Please write your name, section number, and section 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 (13 numbered pages) before starting. The exam is closed book. No graphing calculators are allowed! The last numbered 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 or subproblems that are not multiple choice. Two blank pages are attached at 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.
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Physics 213 Practice Final Fall 2007 page 2 of 13 1. True/False [10 points] Indicate T (True) or F (False) in the space at left for each of the following statements. ____ An appropriate unit for impedance is Ohm-second ( -s). ____ The magnetic forces between the adjacent coils of a solenoid act to decrease the solenoid length and increase its radius. ____ The integral of r B " d r A over a closed surface, in the case of a uniform magnetic field, is equal to the total surface area times the magnetic field magnitude. ____ A charged particle subject only to magnetic forces has constant kinetic energy. ____ To cause a time-varying magnetic flux through a circular loop confined to a region with a uniform magnetic field r B , you can move the loop in a direction perpendicular to r B . ____ A bar magnet dropped into the top of a vertical aluminum tube will be emerge from the tube’s bottom more slowly than a non-magnetic bar dropped through the tube. ____ The asymptotic current in an R-L circuit powered by an ideal battery with emf E depends on the values of all of R, L and E . ____ The ratio of units [E]/[B] is “meters / second” in the MKS system. ____ In an AC circuit, a capacitor is effectively "invisible" at very high frequency, i.e. virtually indistinguishable from an ideal conductor. ____ The peak power in an AC circuit is given by the average power multiplied by 2 .
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Physics 213 Practice Final Fall 2007 page 3 of 13 2. [3 points] A conductor has electrons as the charge carrier of electric current. You place the conductor in a region containing a uniform magnetic field in the positive z direction ( r B = B ˆ k , out of page). If you run an electric current in the positive x direction ( r J = J ˆ i ) through your conductor, then a Hall effect voltage difference would result from an electric field in what direction? 1. +x direction
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This note was uploaded on 08/27/2009 for the course PHYS 2213 taught by Professor Perelstein,m during the Fall '07 term at Cornell.

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P213FinalExam2006 - Physics 213 Practice Final Fall 2007...

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