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Unformatted text preview: Alvarado, Patrick Homework 1 Due: Jan 24 2007, midnight Inst: Opyrchal, H 1 This print-out should have 9 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 You have a neutral balloon. The charge of an electron is- 1 . 6 10- 19 C. What is its charge after 14000 electrons have been removed from it? Correct answer: 2 . 24 10- 9 C. Explanation: Let : n = 14000 and q e =- 1 . 6 10- 19 C . The removal of n electrons leaves a positive charge on the balloon of q =- n q e =- (14000)(- 1 . 6 10- 19 C) 1 10 6 C 1 C = 2 . 24 10- 9 C . keywords: 002 (part 1 of 1) 10 points When a positively charged conductor touches a neutral conductor, the neutral con- ductor will 1. stay neutral. 2. lose protons. 3. lose electrons. correct 4. gain protons. 5. gain electrons. Explanation: When the two conductors touch, the elec- trons in the neutral conductor will move over to the positively charged conductor, since the latter will define a region of higher potential than the neutral conductor. keywords: 003 (part 1 of 1) 10 points Two charged particles of equal magnitude (+ Q and- Q ) are fixed at opposite corners of a square that lies in a plane (see figure be- low). A test charge- q is placed at a third corner. + Q- q- Q What is the direction of the force on the test charge due to the two other charges? 1. 2. 3. 4. 5. 6. 7. 8. correct Explanation: The force between charges of the same sign is repulsive. The force between charges with opposite signs is attractive. Alvarado, Patrick Homework 1 Due: Jan 24 2007, midnight Inst: Opyrchal, H 2 + Q- q- Q The resultant force is the sum of the two vectors in the figure above. Therefore the correct choice is keywords: 004 (part 1 of 1) 10 points A particle with charge 3 C is located on the x-axis at the point- 10 cm , and a second particle with charge- 3 C is placed on the x-axis at- 6 cm . The Coulomb constant is 8 . 9875 10 9 N m 2 / C 2 ....
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