Torque: A flat circular wire loop of area 0.25 m2 carries a current of 5.0 A. This coil lies on a horizontal table with the current flowing in the counterclockwise direction when viewed from above. At this point, the earth's magnetic field is 1.2 × 10-5 T directed 60° below the horizontal. What is the magnitude of the torque that the earth's magnetic field exerts on this loop?
A. 2.5 × 10-6 N ? m
B. 5.0 × 10-6 N ? m
C. 7.5 × 10-6 N ? m
D. 1.0 × 10-5 N ? m
Answer: C
Physics & Space Science
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