21. The active magnetic dipoles in this case are those of the electron shells of the paramagnetic atoms. 22. There is an energy associated with a magnetic dipole moment in the presence of a magnetic field. 23. The field does exert a torque on the magnetic dipole tending to align it with the field. 24. The intrinsic electron magnetic dipole moment is approximately equal to the Bohr magneton " ?" 25. A value of ? can also be extracted from the anomalous magnetic dipole moment of the muon. 26. Thus an atom with unpaired electrons acts as a magnetic dipole and interacts with a magnetic field. 27. On a micro scale, magnetic fields also affect moving electric charges in addition to magnetic dipoles . 28. This pole model is also called the " Gilbert model " of a magnetic dipole . 29. The assumption of a coaxial magnetic dipole field implies that only global scale structures can be simulated. 30. Sometimes an atom has a net magnetic dipole moment even in the absence of an external magnetic field.
