phys2020_exam2_fa07_v0001_solutions

phys2020_exam2_fa07_v0001_solutions - Examination 2,...

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Examination 2, Version 0001 Physics 2020 - Fall 2007 Name (print last, first) _______________________________________________ Student ID# _______________________________________________ Do not open the exam until you are told to do so. This exam consists of 20 multiple-choice questions, worth 5 points each, 100 points total. Fill in the bubble sheet with the correct answers with a #2 pencil. The exam is closed book, closed notes, and no calculators are allowed. You must follow the below instructions: 1. Print and bubble your name on the bubble sheet. 2. Print and bubble your student identification number on the bubble sheet. 3. Print and bubble your exam version (0001 or 0002), in the upper left of your bubble sheet in the area marked 1234. The version number is printed at the top of this sheet! 4. Please leave the areas labeled Code and Date blank. 5. Erase mistakes as thoroughly as possible. Ask for a fresh bubble sheet if you fear you cannot thoroughly erase mistakes. 6. As you take the exam, circle the correct answers on your exam as well as marking them on the bubble sheet. You can take the exam with you at the end so you can see which questions you correctly answered when comparing to posted solutions. 7. At the end of the exam, check that you have filled in the first 20 questions on the bubble sheet, with only one bubble filled in for each question. I have read and will follow the instructions above. Signature________________________________________________________ * There is a penalty of 5 points if you do not fill in the bubble sheet correctly for your exam version, name or student identification.
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Question 1: Which of the following statements is/are true about the following circuits? Assume all batteries and all bulbs are identical. A) Bulb A does not turn on, because the Voltage difference across it is zero. B) Bulb B does not turn on, because the Voltage difference across it is zero. C) Bulb C does not turn on, because the Current flowing through it is zero. D) Answers (A) and (B) are both true. E) Answers (A) and (B) and (C) are all true. Answer E. Bulbs A and B have zero Voltage difference across them, which can be shown using the Voltage Loop Rule. Bulb C is in parallel with a zero resistance wire. Thus, it Bulb C will have zero current flowing through it.
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Question 2: We start with the left circuit with two different light bulbs (A) and (B). The resistance of light bulb (A) is larger than the resistance of light bulb (B). Assume the brightness of the bulbs directly reflects the power. If we remove the second bulb (B) as shown on the right, what happens to the bulbs? Assume both light bulbs behave as Ohmic devices. A) Bulb A is dimmer than before B) Bulb A is brighter than before C) Bulb A is equally bright as before D) Impossible to determine with the information given. Answer B.
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This note was uploaded on 04/28/2008 for the course PHYS 2020 taught by Professor Dubson during the Spring '06 term at Colorado.

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phys2020_exam2_fa07_v0001_solutions - Examination 2,...

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