Exam 3 -- Fall 2003 - Physics 240 Fall 2003: Exam #3 Please...

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Physics 240 Fall 2003: Exam #3 Please print your name:___________________________________________________ Please list your discussion section number:___________________________________ Please list your discussion instructor:________________________________________ Form #1 Instructions 1. Fill in your name above 2. This will be a 1.5 hour, closed book exam. The exam includes 20 questions. 3. You may use a calculator, please do not share calculators 4. You may use three 3”x5” note cards (two from the earlier exams, plus one new one) with notes and equations you think may be useful. You can write on both sides of the card if you like. 5. You will be asked to show your University student ID card when you turn in your exam. ID checked by:___________________________________ Table of constants: ε 0 = 8.85 x 10 -12 C 2 /Nm 2 k = 1/(4 πε 0 ) q electron =-1.6 x 10 -19 C q proton =1.6 x 10 -19 C m electron =9.1 x 10 -31 kg m proton =1.67 x 10 -27 kg µ 0 = 4 π x 10 -7 Tm/A G = 6.67 x 10 -11 Nm 2 /kg 2
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1: Imagine a long wire with radius R in which the current density j increases linearly from zero at the center of the wire to some value j edge at the outer edge. Such a current density can be expressed j(r) = (j edge /R)r. What is the magnetic field inside the wire, at a distance “a” from the center of the wire? A) µ 0 j edge a 2 / 3R B) µ 0 j edge a / 2R C) 2 πµ 0 j edge / R D) 2 πµ 0 j edge a E) 2 µ 0 j edge a 2 / R 2: A small bar magnet is dropped, north pole down, towards the centers of several different loops of wire, each of which is held fixed in place. Loop A has resistance R, loop B has resistance 2R, and loop C has a small break in it. Which of the following statements is correct? A) The magnet accelerates downward at the same rate in each case B) The magnet accelerates down toward loop C, but accelerates up and away from loops A and B C) The magnet accelerates down towards all loops, most rapidly towards, B, most slowly towards C D) The magnet accelerates down towards all loops, most rapidly towards A, most slowly towards B E) The magnet accelerates down towards all loops, most rapidly towards C, most slowly towards A S N C S N S N A B
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This note was uploaded on 04/01/2008 for the course PHYSICS 240 taught by Professor Davewinn during the Fall '08 term at University of Michigan.

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Exam 3 -- Fall 2003 - Physics 240 Fall 2003: Exam #3 Please...

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