PHY213_SampleExam2

# PHY213_SampleExam2 - PHYSICS 213 PRACTICE EXAM 2*The actual...

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PHYSICS 213 – PRACTICE EXAM 2* *The actual exam will contain EIGHT multiple choice quiz-type questions covering concepts from lecture (16 points), ONE essay-type question covering an important fundamental principle from lecture (4 points), and FOUR problems similar to the problems that follow (80 points). NAME (printed) SIGNATURE Student Number SECTION Wait for oral instructions before starting the test. INSTRUCTIONS Remember to show (in English) your problem solving steps for FULL CREDIT. A calculator and a one-sided 8½X11 student reference sheet are permitted. Your reference sheet may contain equations, graphs, and notes; however, quiz questions and worked out problems CANNOT be included. Cell phones/communication devices must be put away. For the graders: Q1-9 P1 P2 P3 P4 TOTAL

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Resistance and Drift Velocity [20 Points] Suppose you wish to fabricate a uniform wire from 4.00 g of platinum. The resistivity of platinum is 11.0 x 10 -8 m and the density is 21.4 g/cm 3 . The wire is to have a resistance of 2.50 and all the platinum is to be used. a) Find the length and Answer: l = 2.06 m, d = 3.40 x 10 -4 m diameter of the wire. [9 points] b) If the platinum wire carries a current of 8.00 A, find the drift speed of the electrons in the wire. Assume each platinum atom supplies one electron. The mass of one mole of platinum is 195 g. [9 points] Answer: v = 8.34 x 10 -3 m/s c) How long does it take electrons to travel the length of the wire? [2 points] Answer: t = 4.12 minutes
Resistor Combination [20 Points] Considerer the following system of resistors. a)

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PHY213_SampleExam2 - PHYSICS 213 PRACTICE EXAM 2*The actual...

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