GPII - Homework 2, Potential - solutions

GPII - Homework 2, Potential - solutions - honea (cth632)...

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Unformatted text preview: honea (cth632) H2Potential avram (1956) 1 This print-out should have 27 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Two charges are located along the x-axis. One has a charge of 6 . 2 C, and the second has a charge of 3 . 4 C. The Coulomb constant is k e = 8 . 98755 10 9 N m 2 / C 2 . The acceleration of gravity is 9 . 81 m / s 2 . If the electrical potential energy associated with the pair of charges is 5 . 10- 2 J, what is the distance between the charges? Correct answer: 3 . 79018 m. Explanation: Let : q 1 = 6 . 2 C , q 2 = 3 . 4 C , U electric = 5 . 10- 2 J , and k e = 8 . 99 10 9 N m 2 / C 2 . U electric = k e q 1 q 2 r r = k e q 1 q 2 U electric = (8 . 99 10 9 N m 2 / C 2 ) (6 . 2 10- 6 C)( 3 . 4 10- 6 C) 5 . 10- 2 J = 3 . 79018 m . 002 10.0 points It takes 140 J of work to move 2 . 7 C of charge from a positive plate to a negative plate. What voltage difference exists between the plates? Correct answer: 51 . 8519 V. Explanation: Let : W = 140 J and q = 2 . 7 C . The voltage difference is V = W q = 140 J 2 . 7 C = 51 . 8519 V . 003 10.0 points Two negatively charged spheres with different radii are shown in the figure below. Q Q The two conductors are now conneted by a wire. Which of the following occurs when the two spheres are connected with a conducting wire? 1. No charge flows. 2. Negative charge flows from the larger sphere to the smaller sphere until the elec- tric potential of each sphere is the same. 3. Negative charge flows from the larger sphere to the smaller sphere until the elec- tric field at the surface of each sphere is the same. 4. Negative charge flows from the smaller sphere to the larger sphere until the elec- tric field at the surface of each sphere is the same. 5. Negative charge flows from the smaller sphere to the larger sphere until the electric potential of each sphere is the same. correct Explanation: When the wire is connected, charge will flow until each surface is at the same potential. honea (cth632) H2Potential avram (1956) 2 When disconnected the potential of each sphere is given by V = k e q r . The smaller sphere is at a more negative po- tential than the larger sphere, so negative charge will flow from the smaller sphere to the large one until they are at the same po- tential. 004 (part 1 of 6) 10.0 points + + + + + + + The dotted line or surface in the figure above 1. cannot be determined from the informa- tion given. 2. is an equipotential line or surface. cor- rect 3. is not an equipotential line or surface....
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This note was uploaded on 04/12/2011 for the course PHYS 1402 taught by Professor Avram during the Spring '10 term at Austin Community College.

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GPII - Homework 2, Potential - solutions - honea (cth632)...

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