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The direction of the magnetic field is perpendicular to the pivot axis of the loop. The magnetic field makes an angle theta with the loop’s surface normal n caret. The length and the width of the loop are a and b respectively. The four arms of the loop are labeled, 1, 2, 3, and 4. The directions of the currents in the arms 1 and 3 are perpendicular to the magnetic field. The forces F sub 1 and F sub 3 acting on the arms 1 and 3 are opposite in direction, and are perpendicular to the pivot axis. The directions of the currents in the arms 2 and 4 are along the magnetic field. The forces F sub 2 and F sub 4 acting on the arms 2 and 4 are opposite in direction, and are along the pivot axis.