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Unformatted text preview: 39. The applied field has two components: B x > 0 and B z > 0. Considering each straightsegment of the rectangular coil, we note that Eq. 2926 produces a nonzero force only for the component of ~ B which is perpendicular to that segment; we also note that the equation is effectively multiplied by N = 20 due to the fact that this is a 20turn coil. Since we wish to compute the torque about the hinge line, we can ignore the force acting on the straightsegment of the coil which lies along the y axis (forces acting at the axis of rotation produce no torque about that axis). The top and bottom straightsegments experience forces due to Eq. 2926 (caused by the B z component), but these forces are (by the righthand rule) in the ± y directions and are thus unable to produce a torque about the y axis. Consequently, the torque derives completely from the force exerted on the straightsegment located at x = 0 . 050 m, which has length L = 0 . 10 m and is shown in Figure 2936 carrying current in the...
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.
 Fall '08
 SPRUNGER
 Physics

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