HW14soln - Physics 21 Fall 2007 Solution to HW-14 A Wire...

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Physics 21 Fall 2007 Solution to HW-14 A Wire and a Compass You are looking straight down on a mag- netic compass lying flat on a table. A wire is stretched horizontally under the table, parallel to and a short distance below the com- pass needle. The wire is then connected to a battery so that a cur- rent I flows through the wire. This current causes the north pole of the compass needle to deflect to the left. The following questions ask you to compare the effects of different actions on this initial deflection. (A) If the wire is lowered farther from the compass, how does the new angle of deflection of the north pole of the com-pass needle compare to its initial deflection? IT IS SMALLER because the magnitude of the B field decreases when the wire is moved further awa y. (B) With the wire back at its initial location, you connect a second identical battery in series with the first one. When you close the switch, how does the new angle of deflection
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This note was uploaded on 02/29/2008 for the course PHYSICS 21 taught by Professor Hickman during the Spring '08 term at Lehigh University .

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