magnetic dipole moment The fundamental difference of magnetism from electricity is that there are no separate positive and negative magnetic poles. Motion of electric charges produces magnetic fields. A current loop produces magnetic field as the electric dipole * produces the electric field. Therefore the current loop is called the magnetic dipole with magnitude of magnetic dipole moment, m given by,

m = iA n [ ampere.meter² ]

where i is the current and A is the area of the loop. The unit vector n is in the direction given by the right hand screw rule.