But ttttt = I A × B, and since A of the horizontal loop is in the vertical
direction, t would be in the plane of the loop for any B (b) Orientation of stable equilibrium is one where the area vector A
of the loop is in the direction of external magnetic field In this
orientation, the magnetic field produced by the loop is in the same
direction as external field, both normal to the  plane of the loop,
thus giving rise to maximum flux of the total field (c) It assumes circular shape with its plane normal to the field to
maximise flux, since for a given perimeter, a circle encloses greater
area than any other shape