You are working with the square wire loop shown in Figure P27.72. The loop lies in a
Question:
You are working with the square wire loop shown in Figure P27.72. The loop lies in a magnetic field, is connected to a battery, and is attached to an axis that runs through its center and is parallel to the plane of the loop. Initially the loop is held in place, but once it is released, it immediately rotates \(180^{\circ}\) about this axis. You know that magnetic fields can induce a torque on a current-carrying wire, but you are surprised by the rotation of exactly \(180^{\circ}\). In an attempt to explain why this happened, you determine the direction of the current in the loop and the direction of the magnetic field in the region of the loop. Are multiple answers possible? Is there any way to keep the loop rotating in the same direction?
Data from Figure P27.72
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