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Unformatted text preview: Platt, David Homework 1 Due: Sep 7 2005, 4:00 am Inst: Ken Shih 1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points Two metal spheres that are initially un- charged are mounted on insulating stands, as shown. X Y---- A negatively charged rubber rod is brought close to but does not make contact with sphere X . Sphere Y is then brought close to X on the side opposite to the rubber rod. Y is allowed to touch X and then is removed some distance away. The rubber rod is then moved far away from X and Y . What are the final charges on the spheres? Sphere X Sphere Y 1. Negative Negative 2. Negative Positive 3. Positive Negative 4. Positive Positive 5. Zero Zero 002 (part 1 of 2) 10 points A set of eight point charges, each of magni- tude 8 10- 8 C, is located on the corners of a cube with sides of length 2 m as shown in the figure. q q q q q q q q x z y A Find the x-component of the resultant force exerted on the charge located at point A by the other charges. Answer in units of N. 003 (part 2 of 2) 10 points What is the magnitude of this force? Answer in units of N. 004 (part 1 of 2) 10 points Four charges- 2 10- 9 C at (0 m,0 m),- 1 10- 9 C at (- 4 m,- 1 m), 2 10- 9 C at (- 3 m,2 m), and 5 10- 9 C at (4 m,3 m), are arranged in the ( x,y ) plane (as shown in the figure below, where the scale is in meters). y ( m )- 5- 3- 1 1 2 3 4 5 x ( m )- 5- 4- 3- 2- 1 1 2 3 4 5- 2 nC- 1 nC 2 nC 5 nC Find the magnitude of the resulting force on the- 2 nC charge at the origin [coordinates, (0 m , 0 m)]. Answer in units of N....
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