The plane of a circular current loop is oriented at a nonzero angle u relative to a magnetic field parallel to z (Fig. P20.60). If the current loop is free to rotate about an axis perpendicular to z, which of the following is true?
(a) The loop will rotate so that the axis of the loop (indicated by the dashed line in the figure) is perpendicular to
(b) The loop will rotate so that the axis of the loop is parallel to
(c) Either (a) or (b) is possible, depending on the direction of the current in the loop.
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