I'm asking the above question as I imagined a current loop made out of a curving wire that cannot fit into a flat plane. Where does the direction of μ point then? Also, is there only one μ value for any current loop, independent of the chosen axis of tilting? Or can a current loop have different values of μ depending on the angular position of the axis of tilting? The angular positions lie in a plane perpendicular to the external uniform magnetic field. The axis is parallel to that plane and also perpendicular to the B field. A current loop will experience a torque about the axis.