Exam+1+--+Winter+2005+--+Blank

Exam+1+--+Winter+2005+--+Blank - Form L Physics240 p 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 IL-12 O25 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 9-10 004 005 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 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 end of 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, and is positive, then Q, must feel a net force to the right. b) If is positive, q is negative, and might feel a net force to the right. c) If 8r, Qr,^d Q, ue all positive, the net force on must be zero. d) If the net force on 8, is zero, Nd I, musthave opposite signs. e) O,i,.i, fnd t are the net forces on charges q, and respectively, then Fr+4.+4:0. (The correct 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-&-{ rr u\ Q'^ ' 4neoli D# o {3Q'- 4neol-i il ^30" 2neoli e)0 AA /\ o 0
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3. Two charged particles, the first one with charge q, and mass ,7h and the second one with charge q, and mass rnz, are acrelerated from rest by a potential difference of AV. The ratio of these two particles' speeds, vrfv* is equal to: a) Q{tz Qz\ b) ,,w \Qzmr W c) .i- \mt d)L 8z ") ,':L \QZ (The correct answer is b.) 4. Cross sections of equipotential surfaces are shown for a region around the origin on the right' Which of the
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Exam+1+--+Winter+2005+--+Blank - Form L Physics240 p 1....

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