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Unformatted text preview: Platt, David Homework 19 Due: Oct 24 2005, 4:00 am Inst: Ken Shih 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points A conductor suspended by two flexible wires as in the figure has a mass per unit length of . 86 kg / m. The acceleration of gravity is 9 . 8 m / s 2 . B in What current must exist in the conductor in order for the tension in the supporting wires to be zero when the magnetic field is 3 . 7 T into the page? Answer in units of A. 002 (part 1 of 1) 10 points An infinitely long straight wire is bent as shown in the figure. The circular portion has a radius of 190 cm with its center a distance r from the straight part. I I 190 cm r Find r so that the magnetic field at the center of the circular portion is zero. Answer in units of cm. 003 (part 1 of 1) 10 points An infinitely long straight wire carrying a current I 1 = 46 . 9 A is partially surrounded...
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