Solutiontest4 - FINAL EXAM Physics 108 Fall 2003 Print your...

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1 FINAL EXAM Physics 108 Fall 2003 December 17, 2003 3:30 p.m. - 6:30 p.m. Print your FIRST name: ________________________________ Print your LAST name: ________________________________ Sign your name: ______________________________________ Person number: ______________________________________ Circle your lecture Instructor Cerne T,Th 12:30-1:45 pm Petrou M,W,F 2:00-2:50 pm Instructions This is a closed book exam There are four problems Allow approximately 30 minutes for each problem (P) and 15 minutes for each mini problem (MP) You must show ALL work to receive full credit. Numerical answers must have the right units, and if vectors proper directions Use the back of the problem page if you need more space and mark OVER on the front of the page so that your work will be counted. Place your answers in the answer boxes at the bottom of each problem page. Useful Constants ε o = 8.85 × 10 -12 C 2 /N.m 2 k = 8.99 × 10 9 Nm 2 /C 2 e = 1.6 × 10 -19 C m e = 9.11 × 10 -31 kg µ o = 4 π× 10 -7 T.m/A m p = 1.67 × 10 -27 kg Please do not write below this line Problem Number Maximum Score Your Score Grader P1 25 P2 25 P3 25 MP1 15 MP2 15 MP3 15 MP4 15 MP5 15 MP6 15 TOTAL 165
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2 Print our name: ____________________________ P1. A rectangular wire loop (dimensions: h = 12.0 cm, w = 15.0 cm) is placed in a uniform magnetic field B as shown in fig.a. The magnetic field B changes with time t as shown in fig.b. The resistance R of the loop is 0.5 a. (6) Determine the induced emf E on the loop for 0 < t < 0.1 s b. (6) Determine the induced emf E ' on the loop for 0.1 s < t < 0.2 s c. (2) Calulate the induced current I during the time interval 0 < t < 0.1 s d. (6) Use Lenz’s rule to determine the direction of the induced current during the time interval 0 < t < 0.1 s e. (5) Determine the total charge Q that flows through a cross section of the loop wire during the time interval 0 < t < 0.2 s C 10 4 . 5 1 . 0 0 1 . 0 10 4 . 5 It Q (e) flux magnetic the reduce to tends thus and B of direction opposite in the is B field magnetic induced that the so fig.a) (see direction (CW) clockwise in the flow must current induced The increases. flux magnetic the (a) part From ) ( 10 4 . 5 5 . 0 10 7 . 2 R I ) ( 0 0 ) 15 . 0 ( ) 12 . 0 ( dt d ) ( 10 7 . 2 1 . 0 0 15 . 0 ) 15 . 0 ( ) 12 . 0 ( dt d dt d ) ( 3 2 ind 2 2 2 × = × + × × = = Φ × = × = = = × × = = × = × = = Φ = = Φ d A c B hw b V B hw Bhw a E E E E Place your answers here. (a) E = V 2 10 7 . 2 × (6) (b) E = 0 (6) (c) I = A 2 10 4 . 5 × (3) (d) Direction of I: Circle one: CW CCW (6) ( e ) Q = C 10 4 . 5 3 × (5) B 0.15 T O 0.1 s 0.2 s t Fig.b h w B Fig.a X .
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This test prep was uploaded on 04/14/2008 for the course PHYSICS 108 taught by Professor Halstead during the Spring '08 term at SUNY Buffalo.

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Solutiontest4 - FINAL EXAM Physics 108 Fall 2003 Print your...

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