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  4. The ratio of intensity of magnetisation and magnetising field is called

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Q. The ratio of intensity of magnetisation and magnetising field is called

Magnetism and Matter

Solution:

Magnetic susceptibility, quantitative measure of the extent to which a material may be magnetized in relation to a given applied magnetic field. The magnetic susceptibility of a material, commonly symbolized by $\chi_m$, is equal to the ratio of the magnetization Mwithin the material to the applied magnetic field strength $H$, or
$\chi_m$ = $I_m / H$
This ratio, strictly speaking, is the volume susceptibility, because magnetization essentially involves a certain measure of magnetism (dipole moment) per unit volume.