Home Work V-solutions Physics

Home Work V-solutions Physics - brown(jmb7226 – Home Work...

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Unformatted text preview: brown (jmb7226) – Home Work V – belay – (2049) 1 This print-out should have 24 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points To recharge a 12 V battery, a battery charger must move 2 . 8 × 10 5 C of charge from the negative terminal to the positive terminal. How much work is done by the battery charger? Correct answer: 3 . 36 × 10 6 J. Explanation: Given : q = 2 . 8 × 10 5 C and V = 12 V . The potential difference is V = W q , W = q V = (2 . 8 × 10 5 C) (12 V) = 3 . 36 × 10 6 J . 002 10.0 points You have a potential difference of 7 V. How much work is done to transfer 0 . 17 C of charge through it? Correct answer: 1 . 19 J. Explanation: Let : V = 7 V and q = 0 . 17 C . The potential difference is V = W q W = V q = (7 V) (0 . 17 C) = 1 . 19 J . 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. 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. 2. Negative charge flows from the smaller sphere to the larger sphere until the electric potential of each sphere is the same. correct 3. No charge flows. 4. 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. 5. Negative charge flows from the larger sphere to the smaller sphere until the elec- tric potential of each sphere is the same. Explanation: When the wire is connected, charge will flow until each surface is at the same potential. 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 brown (jmb7226) – Home Work V – belay – (2049) 2 the large one until they are at the same po- tential. 004 (part 1 of 2) 10.0 points + Q- Q 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. 3. is not an equipotential line or surface. correct Explanation: Consider the electric field: +- The dotted line is an electric field line. 005 (part 2 of 2) 10.0 points + Q- Q 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. Explanation: An equipotential line or surface is perpen- dicular to the electric field lines....
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This note was uploaded on 03/29/2012 for the course PHY 2049 taught by Professor Belay during the Spring '12 term at University of Miami.

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Home Work V-solutions Physics - brown(jmb7226 – Home Work...

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