Modelling the magnetic dipole

Kira Seleznyova (1, 2) , Mark Strugatsky (2) , Janis Kliava (1)

1 LOMA - Laboratoire Ondes et Matière d'Aquitaine
2 Physics and Technology Institute [Simferopol]

Three different models of a magnetic dipole, viz., a uniformly magnetised sphere, a circular current loop and a pair of fictitious magnetic charges, have been systematically analysed within the formalism based on the vector potential of the magnetic field. The expressions of the potentials and magnetic fields produced by each dipole model have been obtained. A computer code has been put forward in order to visualise magnetic field lines for different dipole models. It has been shown that the magnetic field outside the uniformly magnetised sphere coincides with that of a point dipole. The other two models give considerably different results at distances small or intermediate in comparison with the dipole size.

Mots clés: magnetic dipole; uniformly magnetised sphere; circular current loop; pair of magnetic monopoles; magnetic field lines

Domaines: Electromagnétisme

Kira Seleznyova, Mark Strugatsky, Janis Kliava. Modelling the magnetic dipole. European Journal of Physics, 2016, 37 (2), pp.025203 (1-14). ⟨10.1088/0143-0807/37/2/025203⟩. ⟨hal-01275891⟩