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bbbb phys - University of Minnesota School of Physics and...

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University of Minnesota School of Physics and Astronomy Physics 1302, Spring 2006, Section 300 Hour Exam 4 (Practice) 1. A long wire carrying a current of 5 amps to the right is located in the same plane as a 2 cm by 10 cm current loop with a current of 2 amps in the clockwise direction. The near side of the loop is 4 cm from the wire. (a) Is the magnetic force between the wire and the loop attractive or repulsive? (b) What is the magnetic field of the wire at the center of the loop? (c) What is the total magnetic force of the wire on the loop? 2. You have 18 m of wire, a constant magnetic field over a very large area of 0.90 T and a device that can rotate a wire loop or coil at a fixed frequency of 200 Hz. (a) If you form all of the wire into one loop, what is the maximum voltage that you can induce with this apparatus? (b) If you form all of the wire into a 100 turn coil, what is the maximum voltage that you can induce with this apparatus?
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