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Unformatted text preview: 1 y x Quadrant II 5q 5q 10q R R 2R q Quadrant I Quadrant III Quadrant IV Department of Physics, Lehigh University Physics 21 – Introductory Physics II Spring 2007 Hour Exam I February 13, 2007 Closed Notes 9:20 AM-10:10 AM Student’s Name______________________ Recitation Section Number______________ Recitation Leader’s Name_______________ The test is a multiple-choice examination. First, check to be sure that you have a six- page examination, including the equation sheet. Please answer each question by circling one answer from the panel of choices available within each question space. 1. (20 points) Consider the system of four charges, where a test charge q is placed at the origin. A According to the diagram shown on the right, into which quadrant will the Coulomb force on the test charge point? a) Quadrant I; b) Quadrant II; c) Quadrant III; d) Quadrant IV; e) Directly along the + y axis; or f) Directly along the – y axis. B. Which of the following expressions is the expression for the Coulomb force? a) ; b) ; c) ; d) ; or e) . C. Which part of the Coulomb force on charge q changes if the charge q at the origin is made negative? a) Magnitude only; b) Magnitude and direction; c) Direction only; or d) Nothing. D. Let us assume that q is the charge of a proton. If the Coulomb force on q is measured to be 50 pN at the origin, what is the magnitude of the associated electric field?...
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This note was uploaded on 02/20/2008 for the course PHYSIC 2 taught by Professor Kim during the Spring '08 term at Lehigh University .
- Spring '08