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Unformatted text preview: Ch-27: Sources of the Magnetic Field:(Additional Questions)1-)In figure, the long straight wire carries a current of 30A and the rectangular loop carries a current of 20A. Calculate the resultant force acting on the loop.Assume that a = 1 cm, b = 8 cm, and L = 30 cm.Solution:The magnitudes of the forces on the sides of the rectangle which are paralel to the long straight wire ( withi= 30 A ) are calculated as follows. The force on each of the sides lying perpendicular to it ( along ouryaxis, with the origin at the top wire and +ydownward ) would be figured by integrating as follows:Fortunately, these forces on the two perpendicular sides of lenght bcancels out. For the remaining two ( paralel ) sides of lenght L, we obtainand Fpoints towards the wire. 2-)Find the magnetic field Bat point P in figure.Solution:We see that the current in the straight segments colinear with P do not contribute to the field at that point. We use the result to evaluate the contributions to the field at point P, noting that at that point....
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- Spring '09