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The coil in the figure below lies in the y-z plane, has a current, I, in the direction shown and is free to rotate about the z-axis. What should the direction of an external B-field be to cause a clock-wise rotation as shown?
A. Positive y-direction
B. Negative y-direction
C. Positive z-direction
D. Negative z-direction
E. Negative x-direction
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Based on our data, we think this problem is relevant for Professor Heyward's class at NCSU.