152CHAPTER 19 19.25 (a) Let θbe the angle the plane of the loop makes with the horizontal as shown in the sketch at the right. Then, the angle it makes with the vertical is 90.0φθ° −=. The number of turns on the loop is ()4.00 m10.040.100 mLumference==Ncirc=The torque about the zaxis due to gravity is co2gssmgτθ=, where s0.100 m=is the length of one side of the loop. This torque tends to rotate the loop clockwise. The torque due to the magnetic force tends to rotate the loop counterclockwise about the zaxis and has magnitude
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