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Unformatted text preview: 12/17/10 9:16 PM Ch18 HW3 F2010 Page 1 of 3 http:[email protected][email protected] Current Score : 21.125 / 21.5 Due : Wednesday, September 29, 2010 11:25 AM EDT 1. 2/2 points Question: MI3 18.7.X.047 A straight wire of length 0.59 m carries a conventional current of 0.2 amperes. What is the magnitude of the magnetic field made by the current at a location 2.9 cm from the wire? Use both the exact formula and the approximate formula to calculate the field. (a) result using exact formula B = 1.37e-6 1.37e-06 T (b) result using approximate formula B = 1.38e-6 1.38e-06 T 2. 12.375/12.5 points Question: MI3 18.6.X.051 A wire through which a current is flowing lies along the x-axis as shown. Connecting wires which are not shown in the diagram connect the ends of the wire to batteries (which are also not shown). Electron current flows through the wire in the -x direction, as indicated in the diagram. To calculate the magnetic field at location A due to the current in the wire, we divide the wire into pieces, approximate each piece as a point charge moving in the direction of conventional current, and calculate the magnetic field at the observation location due only to this piece; then add the...
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