Question

For diamagnetic materials, magnetic susceptibility is

• A. Small and negative
• B. Small and positive
• C. Large and negative
• D. Large and positive

Answer 1

The correct option is A Small and negative

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.

$\therefore$ ${\mu }_r=(1+{\chi }_m)<1$

$⟹$ ${\chi }_m<0$

Thus magnetic susceptibility of diamagnetic materials is very small and negative.

For example : For Silicon, ${\chi }_m=$ $-4.2\times {10}^{-6}$