F05Exam1

# F05Exam1 - PHYSICS 222 FALL 2005 EXAM#1 Name(printed...

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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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## 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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F05Exam1 - PHYSICS 222 FALL 2005 EXAM#1 Name(printed...

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