F05Exam1 - PHYSICS 222, FALL 2005 EXAM #1 SEPTEMBER 29,...

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PHYSICS 222, FALL 2005 EXAM #1 SEPTEMBER 29, 2005 Name (printed): ____________________________________________ Nine-digit ID Number: ____________________________________________ Section Number: ____________________________________________ Recitation Instructor: ____________________________________________ INSTRUCTIONS: i. Put away all materials except for pens, pencils, erasers and your calculator. Turn off your cell phone if you have one. ii. Fill in your name, identification number, section number and recitation instructor above and on the front of the multiple choice answer sheet using a number 2 pencil. iii. This exam contains 15 multiple choice problems worth 2 points each (problems 1-15), and 15 multiple choice problems worth 4 points each (problems 16-30), for a total of 30 problems worth 90 course points. iv. In marking the multiple choice answer sheet use a number 2 pencil. Do NOT use ink. If you did not bring a pencil, ask for one. Fill in the appropriate circles completely. If you need to change any entry, you must completely erase your previous entry. v. Carefully read each problem completely and its five possible answers before beginning to work the problem. For each problem, select one answer that is closest to the correct one. vi. Please turn over or cover your answer sheet when you are not marking it. vii. Before handing in your exam, copy down your answers on a piece of unused scratch paper for comparison with the answer key to be posted later. viii. When you are finished with the exam, please place all exam materials, including the answer sheet, the exam itself and scratch paper, in your folder and return the folder to your recitation instructor. GOOD LUCK!!
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Note: i ˆ , j ˆ , and k ˆ are unit vectors directed in the +x, +y, and +z directions, respectively, of a right-handed Cartesian coordinate system. Problems 1-15 are worth 2 points each. 1. At some instant of time, a negatively charged particle is moving with velocity v = v i ˆ in a magnetic field B = B k ˆ , where v is the particle's speed and B is the magnitude of B . The direction of the magnetic force on the particle is ____ . A. i ˆ B. i ˆ C. j ˆ D. j ˆ E. k ˆ 2. A current-carrying circular coil with a magnetic moment µ is in a uniform magnetic field B . The maximum magnitude of the magnetic torque on the coil occurs when the angle between µ and B is ____ degrees. A. 0 B. 45 C. 90 D. 135 E. 180 3. A sphere of radius R is in a uniform magnetic field of magnitude B. The magnitude of the net magnetic flux through the surface of the sphere is ____ . A. 0 B. π R 2 B C. 2 π R 2 B D. 4 π R 2 B E. 8 π R 2 B 4. Two long thin straight parallel wires each carry the same magnitude of current I but in opposite directions. The distance between the axes of the wires is d. The magnitude of the (net) magnetic field at a point midway between the two axes of the wires is ____. A. 0 B. 2 µ o I π d C. µ o I 2 π d D. µ o I d E. µ o I 2d 5. The magnetic field at the center of a circular wire loop of radius R and carrying a current I ____ A. is zero.
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F05Exam1 - PHYSICS 222, FALL 2005 EXAM #1 SEPTEMBER 29,...

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