sp09test3

sp09test3 - PRINT Your Name: _______________________

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Unformatted text preview: PRINT Your Name: _______________________ Instructor:__________________ Louisiana State University Physics 2102, Exam 3 April 2nd, 2009. Please be sure to PRINT your name and class instructor above. The test consists of 4 questions (multiple choice), and 4 problems (numerical). For the problems: Show your reasoning and your work. Note that in many of the problems, you can do parts (b) or (c) even if you get stuck on (a) or (b). You may use scientific or graphing calculators, but you must derive and explain your answer fully on paper so we can grade your work. Feel free to detach, use, and keep the formula sheet pages. No other reference material is allowed during the exam. May The Force Be With You! Question 1 [8 points] The figure shows four orientations, at angle , of a magnetic dipole moment r in a magnetic field B r . (i) (4 pts) If the dipole moment r is rotated from orientation (2) to orientation (1) by an external agent, is the work done on the dipole by the agent? (circle one) Positive Negative Zero (ii) (4 pts) Rank the work done on the dipole by the agent for these three rotations, greatest first: A: (2) (1) B: (2) (4) C: (2) (3) Problem 1 [18 points] In the figure below, two semicircular arcs (I & II) have radii R 1 = 4.10 cm and R 2 = 6.60 cm, carry current i = 0.281 A, and share the same center of curvature C . The same current i also flows through the straight sections of wire labeled III & IV. (a) (5 pts) What is the contribution to the magnitude of the magnetic field at point C from the two straight sections of wire III and IV? Explain your answer! (b) (8 pts) Calculate the magnitude of the magnetic field at the point C due to all four sections of wire. (c) (5 pts) What is the direction of the total magnetic field at the point C due to all four sections of wire? Circle one: Out of the page ) ( . Into the page . Up towards the top of the page . Down towards the bottom of the page . To the right of the page . To the left of the page . The total magnetic field at C is zero and has no direction. Question 2 [8 points] The figure below shows four arrangements in which long parallel wires carry equal currents i directly into or out of the page at the corners of identical squares. (i) (4 pts) For square B, what is the direction of the magnetic field, with respect to the page, at the center of the square? Circle one: Out ) ( In Up Down Left Right Field is Zero ) ( = B r (ii) (4 pts) Rank the sections according to the magnitude of the magnitude of the...
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This note was uploaded on 05/20/2011 for the course PHYS 2102 taught by Professor Gimmnaco during the Fall '08 term at LSU.

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sp09test3 - PRINT Your Name: _______________________

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