Hey there! I would really appreciate if someone could help me with the following problem. I didn't find it anywhere (textbooks, web...). Not only currents but also magnetized bodies possess magnetic moment. I know that if the magnetized body is at rest in a constant external magnetic field its magnetic moment will align to the direction of the external field. One can understand this by thinking that this parallel configuratioin minimizes the (magnetic) energy of the system. That's fine. Thus, my problem is the following: what would happen if the magnetized body was rotating (aroung the magnetic moment axis) initially? Would the body's magnetic moment also align to the external magnetic field and stays there? Or would it exhibit a precession motion just like the magnetic moments of elementary particles do? It does seems to me that something would be different since the rotation would mean that there are charges in movement and therefore another magnetic moment would be associated. I happen to think now, but I'm not quite sure. Assuming, as I did, that the the rotation axis coincides with the magnetic moment (due to magnetization), the magnetic moment due to rotation would be parallel to the first, so in the end the rotation would only contribute to increase the magnitude of the magnetic moment. Therefore, qualitatively being the same process. I think this problem is important and is completely overlooked. The behavior of the magnetic moment of elementary particles does seem to be completely different from the behavior of macroscopic bodies. Thanks a lot! Cheers!