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Q.
Magnetic susceptibility for a diamagnetic substance is
Magnetism and Matter
Solution:
Diamagnetic materials create an induced magnetic field in a direction opposite to an external applied magnetic field and are repelled by applied magnetic field.
Magnetic permeability of the diamagnetic materials is little less than unity.
$\therefore \mu_{ r }=\left(1+\chi_{ m }\right)<1 $
$\Rrightarrow \chi_{ m }<0$
Thus magnetic susceptibility of diamagnetic materials is very small and negative.
For example: For Silicon, $\chi_{ m }=-4.2 \times 10^{-6}$