ABSTRACT
In this chapter, the authors introduce the physical parameters representing the magnetic field and magnetisation of the material. The magnetic parameters initial magnetic susceptibility and saturation magnetisation are determined by the ballistic method recording the magnetisation curve. When magnetising a body which has finite dimensions and is made from a strongly magnetic material, in the external field, the magnetic poles appear on both end surfaces of the body. Magnetisation or remanent magnetisation is determined by the ballistic method by recording the change of the magnetic flux penetrating the turns of the measuring coil during withdrawal of the magnetised specimen from the coil. The changing of the magnetic flux in the coil for measuring the inductance is also achieved by rotating the coil by 180o around the axis normal to the magnetic field lines. A real disperse system is characterised by the distribution of the particles by the magnetic moments and linear dimensions.
