2006 Exam 3 Wkey

2006 Exam 3 Wkey - Physics 2220.004 Spring 2006 Examination...

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Physics 2220.004 Spring 2006 Examination 3 Name: This test consists of 8 multiple-choice questions and 5 free-response problems, for a total of 110 points (so that 10 points of extra credit are possible). To receive credit for the free-response problems, you must show all of your work on the pages provided. Don’t hand in any extra sheets or other paper. You may also earn partial credit for the some of the multiple choice problems if you show your work. Suggested procedure for solving the problems: 1. Read each problem carefully and make sure you know what is being asked before starting the problem. 2. Draw a figure for the problem. 3. List the parameters given. 4. Write down the equations to be used. 5. Solve for the answer symbolically. 6. Substitute numbers into you final equation and circle your answer. WORK THE EASY PROBLEMS FIRST!!

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1. (5 points) In an overhead straight wire, the current is north. The magnetic field due to this current, at our point of observation, is a) east b) up c) north d) down e) west 2. (5 points) A closed loop of wire in a horizontal plane is lowered vertically over a permanent magnet oriented with its south pole up. Viewed from above, as the wire loop is lowered from above the magnet to below the magnet (so that the magnet passes through the loop), a) a current is induced in the clockwise direction only. b) a current is induced in the counterclockwise direction only. c) a current is first induced in the clockwise direction, then in the counterclockwise direction. d) a current is first induced in the counterclockwise direction, then in the clockwise direction. e) no current flows in the wire because there is no source of emf in the circuit. 3. (5 points) A permanent magnet is dropped through a vertical conducting tube and is observed to fall very slowly, as was demonstrated in class. The same magnet is now dropped through a second vertical tube and is observed to fall approximately as fast as it would without the
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2006 Exam 3 Wkey - Physics 2220.004 Spring 2006 Examination...

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