A circular loop (radius = 0.50 m) carries a current of 3.0 A and has unit normal vector of 
/3. What is the x component of the torque on this loop when it is placed in a uniform magnetic field of 
T?
A. 4.7 N ? m
B. 3.1 N ? m
C. 19 N ? m
D. 9.4 N ? m
E. 12 N ? m
Answer: D
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