If an iron piece of area of cross-section A sq meter when placed in an uniform magnetic field of intensity H develops a pole strength of (say) m webers, then the intensity of magnetization I (or J) is defined by
As m is the pole strength induced in the iron piece, the total flux of the piece is m and the flux density is also m/A ; in other words, the intensity of magnetization J, or I, of the iron piece may also be defined as the flux density produced in it due to its own induced magnetism
If l is the length of the iron piece, in meters
where M is the magnetic moment of the piece, and V is its volume in cubic meters.
Thus the intensity of magnetization of a substance can also be defined as the magnetic moment developed per unit volume of the substance.
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