Exam__1_9_27_07 - PHYSICS 222, FALL 2007 EXAM #1 SEPTEMBER...

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PHYSICS 222, FALL 2007 EXAM #1 SEPTEMBER 27, 2007 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 and pager if you have either 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, make sure that your answers on your bubble sheet are the ones you intend them to be. 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 that you used for the exam, 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. A particle with positive charge q is moving at speed v in a magnetic field of magnitude B. If the angle between the particle velocity and the magnetic field is 30 degrees, the magnitude of the magnetic force on the particle is ____ . A. qvB / 2 B. 2qvB C. (qvB) 2 D. 2 qvB E. qvB / 2 2. A flat surface with area A is in a uniform magnetic field of magnitude B. The magnetic flux through the flat surface is ____ . A. 0 B. AB C. 2AB D. AB/2 E. The answer cannot be determined from the information given. 3. Which one of the following five statements is false? A. Magnetic field lines can never cross. B. A circular current carrying coil does not have a North pole or a South pole. C. The magnetic flux through any closed surface is zero. D. Magnetic monopoles do not exist. E. The magnetic field lines due to a uniform current in a long straight wire are circles centered on the axis of the wire. 4. Two long thin parallel wires carry equal currents I but in opposite directions. The magnitude of the magnetic field at a point midway between the axes of the wires is ____ . (d is the distance between the two wires) A. 0 B.
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This note was uploaded on 02/11/2012 for the course PHYSICS 222 taught by Professor Ogilvie during the Fall '05 term at Iowa State.

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Exam__1_9_27_07 - PHYSICS 222, FALL 2007 EXAM #1 SEPTEMBER...

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