exam-solutions-fall2011

exam-solutions-fall2011 - Physics Qualifying Examination...

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Unformatted text preview: Physics Qualifying Examination Problems 16 Thursday, September 1, 2011 15 pm Problems 7-12 Friday, September 2, 2011 1-5 pm 1. Solve each problem. 2. Start each problem solution on a fresh page. You may use multiple pages per problem. 3. At the top of each solution page put the problem number (112) and your FSUID number, but not your name or any other information. Academic Honor Code Students are expected to uphold the Academic Honor Code published in The Florida State University Bulletin and the Student Handbook. The first paragraph is: The Academic Honor System of Florida State University is based on the premise that each student has the responsibility (1) to uphold the highest standards of academic integrity in the student's own work, (2) to refuse to tolerate violations of academic integrity in the University community, and (3) to foster a high sense of integrity and social responsibility on the part of the University community. Specific rules for this exam: 1. Sit only in your assigned seat. 2. All cell phones must be turned off during the exam. 3. You are allowed to bring a hand calculator and a book of math tables, but not one that has a list of physics formulas (e.g. Maxwell's equations or the equations of fluid flow or thermodynamics, etc) or physical constants (e.g. electron mass, acceleration of gravity, etc). If such information should be supplied, it will be included in the statement of the problem (and that is generally the case with numbers like the electron mass, Planck's constant, etc.). 4. you may ask questions to the faculty proctor during the exam. If it is decided something is unfairly left out, that will be announced to everyone in the room. 5. You must not receive any information verbal, written, or otherwise from anyone during the exam except the faculty proctor. 6. You must not give any information to anyone during the exam. Problem 1 Consider the Wheatstone bridge circuit shown in the diagram below. a) Resistors R 1 , R 2 , R 3 , and R 4 can be adjusted until the bridge is balanced. Resistor Rg represents the galvanometer. When the bridge is balanced, no current flows through the galvanometer. What is the electrical potential difference between points A and B when the bridge is balanced? b) Derive the relation between the values of the resistors R 1 , R 2 , R 3 , and R 4 when the bridge is balanced. c) Calculate the power delivered by the battery when the bridge is balanced in terms of the battery voltage and the resistor values. d) An analogous bridge can be made by replacing resistors R 1 , R 2 , R 3 , and R 4 with four capacitors. Would the same power source work for the capacitor bridge? If not, describe what would be needed. Solution Consider the Wheatstone bridge circuit shown in the diagram below....
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This note was uploaded on 03/11/2012 for the course PHY 3900 taught by Professor Staff during the Fall '1 term at FSU.

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exam-solutions-fall2011 - Physics Qualifying Examination...

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