Exam 1--Winter 2005 - Form L Physics240 print your name 1...

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Form L Firrt Exam IVinter 2fi05 Physics 240 1. Please print your name: Instructor Time Section Instructor Time Section Gidley 10-11 O24 Gidley IL-12 O25 Gidley I2-l 026 Bretz I2-I O27 Bretz l-2 O28 Bretz 2-3 O29 I-ast 2. Circle vour discussion instructor and section: Reis 9-10 004 Reis 10-11 005 Reis ll-tz 006 Malinovskaka 2-3 Ol4 Malinovskaka 3-4 015 Malinovskaka +5 016 k = ll4n eo= 9 x loe N. m'/c2 e = 1.6 x 10-1e C First so = 8.85 x 1o-12 c2/N'm2 I eV = 1.6 x 10-1e J 3. Fill in your name, student ID number, section number, and the exam version (form) number on the scantron sheets. 4. There are twenty multiple choice questions, worth 5 points each, for a total of 100 points. Choose the one answer closest to the correct answer. Transfer your answer for each question to the scantron sheet. You must mark the correct answer on the scantrcn sheet to get credit for the problem. There is no penalty for guessing, so be sure to enter an answer for every question. 5. At the endof the exam, hand in your scantron sheet AND your exam copy. 6. The exam is closed book. You mav use a calculator and one 3"x5" card of notes. 7. This is a 90 minute exam.
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1. Three charges are arranged on a line as shown in the figure below. Which one of the following statements is fghp.? a) If Q is negative, Q is negative, and Q is positive, then Q, must feel a net force to the right. b) If Q is positive,q is negative, and Q is positive, then Q might feel a net force to the right. c) If 8r, Qr,^d Q, ue all positive, then the net force on Q must be zero. d) If the net force on 8, is zero, then Q Nd I, musthave opposite signs. e) O,i,.i, fnd t are the net forces on charges Q, q, and Q, respectively, then F r + 4 . + 4 : 0 . (Thecorrect answer is c.) 2. Three identical charges of magnitud e Q areplaced at the corners of an equilateral triangle of size L. What is the magnitude of the net electrical force on one of the charges? Qr Qz Qs G - & - { r r u \ Q ' ^ ' 4neoli D # o {3Q'- ' 4neol-i il ^30" ' 2neoli e ) 0 (Thecorrect answer is c.) AA / \ / \ / \ o 0
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