A square loop of wire carries a current and is located in a uniformmagnetic field. The left side of the loop is aligned and attachedto a fixed axis (dashed line in figure). When the plane of the loopis parallel to the magnetic field in the position shown, what isthe magnitude of the torque exerted on the loop about the axis ofrotation, which is along the left side of the square as indicatedby the dashed line in the figure? Answer in units of N m.


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