PracticeTest2solutions - PHY 2049 Section 0004 Spring 2009...

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PHY 2049 Section 0004, Spring 2009 Test 2 Name and PID:……………………………………………………………………… Please PRINT your name To get full credit you MUST show your work. Use the space provided including the reverse side of each sheet. Write your names on any additional sheets used. Possibly useful information (formula sheet) is provided. Section A (each 2 points) are short descriptive questions. Please read statements for each question and circle the correct statement (answer). Section B requires calculations/derivations. Please be as clear as possible explaining the notations, symbols etc. Section A 1. A wire made of a particular material has resistance R . Another wire made of the same material that has 1/2 the length and 1/4 the diameter has resistance? (a) 8 R (b) 2 R (c) R / 2 (d) R / 4 (e) R / 16 (a) You perform a simple experiment on a light bulb. You steadily increase the voltage across the light bulb as you measure the current through the bulb. In addition, as you increase voltage, you note that the temperature of the bulb increases. Which curve below would best represent your actual data?
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