sp09test1

# sp09test1 - Name Instructor Louisiana State University...

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Name: _______________________ Instructor:__________________ Louisiana State University Physics 2102, Exam 1, February 5, 2009. Please be sure to write your name and class instructor above. The test consists of 4 questions (multiple choice, no partial credit), 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) and (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. Good Luck!

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Question 1 [8 points] The figure shows a central particle of charge –2q, surrounded by two circular rings of charged particles. The radii of the rings are r and R , as shown. (i) (4 pts) What is the magnitude of the net electrostatic force on the central particle due to the other particles? Circle the right answer. (a) 4kq/R 2 (b) 4kq 2 /R 2 (c) 8kq/R 2 (d) 8kq 2 /R 2 (e) zero (ii) (4 pts) Which of the arrows labeled A , B , C , and D gives the correct direction of the net force that acts on the charge at the upper left corner ? (circle the right answer): (a) rightward (b) upward (c) leftward (d) downward (e) force is zero, no direction
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sp09test1 - Name Instructor Louisiana State University...

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