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Unformatted text preview: PHYS 2212 Test 1 Spring 2011 Name(print) Instructions • Read all problems carefully before attempting to solve them. • Your work must be legible, and the organization must be clear. • You must show all work, including correct vector notation. • Correct answers without adequate explanation will be counted wrong. • Incorrect work or explanations mixed in with correct work will be counted wrong. Cross out anything you don’t want us to read! • Make explanations correct but brief. You do not need to write a lot of prose. • Include diagrams! • Show what goes into a calculation, not just the final number, e.g.: a · b c · d = (8 × 10 3 )(5 × 10 6 ) (2 × 10 5 )(4 × 10 4 ) = 5 × 10 4 • Give standard SI units with your results. Unless specifically asked to derive a result, you may start from the formulas given on the formula sheet, including equations corresponding to the fundamental concepts. If a formula you need is not given, you must derive it. If you cannot do some portion of a problem, invent a symbol for the quantity you can’t calculate (explain that you are doing this), and use it to do the rest of the problem. Honor Pledge “In accordance with the Georgia Tech Honor Code, I have neither given nor received unauthorized aid on this test.” Sign your name on the line above PHYS 2212 Do not write on this page! Problem Score Grader Problem 1 (25 pts) Problem 2 (25 pts) Problem 3 (25 pts) Problem 4 (25 pts) Problem 1 (25 Points) An electric quadrapole located at the origin consist of two identical permanent dipoles held perpendicular to each other as indicated on the diagram below. Each dipole is composed of a positive and negative charge q separated by a distance s . (a 6pts) On the diagram below draw and label the net electric field vec tors due to the quadrapole at locations A and B , a distance d from the ori gin on the y and x axis respectively. ( recall that longer arrows mean larger magnitudes ) (b 13pts) A negative charge − Q is placed at location A . What is the magnitude and direction of the net force acting on this charge due to the dipole? You can assume that d >> s . (c 6pts) Does the negative charge − Q cause the dipole to rotate clockwise, counterclockwise or not at all. Please provide justification for your answer. Drawing a figure may help. Problem 2 (25 Points) You have two strips of invisible tape, each about 15 cm long, with a mass of about 0.20 g. You smooth them down onto a table, one on top of the other, as was done in lecture and lab. You label the top tape “A” and the lower tape “B” The “sandwich” of two tapes is pulled slowly off the table. You rub your hand along the slick side of the upper tape, and observe that the tapes, still stuck together, do not interact with your hand....
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 Spring '10
 SHATZ
 Electron, Electric charge

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