PHYSICS 240 Exam 3 -- Fall 2005

PHYSICS 240 Exam 3 -- Fall 2005 - Physics 240 Fall 2005:...

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Physics 240 Fall 2005: 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: A zero resistance rod slides to the right on zero resistance rails separated by 0.3 m. The rails are connected by a 25 Ω resistor. A constant magnetic field of 0.05 T permeates the region, coming straight out of the page. Find the speed at which the bar must be moved to produce a current of 0.01A in the resistor. a) 34 m/s b) 17 m/s c) 89 m/s d) 50 m/s e) 28 m/s 2: Four different loops of wire will move to the right with the same velocity from a region of zero field, into a region with constant field B. Rank them from least to greatest according to the maximum magnitude of the induced EMF they will feel. Relative heights and widths are listed below each loop. a) 1 is least, then 2 and 4 tie, and 3 is greatest b) 2 and 3 are tied for least, 1 and 4 are tied for greatest c) 3 is least, 4 is larger, and 1 and 2 are tied for greatest d) 3 is least, 2 and 4 are tied and larger, 1 is greatest e) 2 and 4 are tied for least, 3 is larger, 1 is greatest . v R = 25 Ω 0.3 m 4 2 1 3 3W x 2H 2W x 2H 3W x 1H 2W x 3H
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3: A small bar magnet is dropped from the same position below the centers of several different loops of wire, each of which is held fixed in place. Loop A has resistance 2R, loop B has resistance R, and loop C has a small break in it. Which of the following statements is correct? a)
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This test prep 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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PHYSICS 240 Exam 3 -- Fall 2005 - Physics 240 Fall 2005:...

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