PYQ NEET- Magnetism And Matter L-5

Question: The magnetic susceptibility is negative for#

A) paramagnetic material only

B) ferromagnetic material only

C) paramagnetic and ferromagnetic materials

D) diamagnetic material only

Answer: diamagnetic material only#

Sol:#

As we know the relation between the magnetic permeability and susceptibility of material, i.e. $$ \mu_r=1+\chi_m $$ $\because$ For diamagnetic substances, $\mu_r<1$ So, according to equation (i), the magnetic susceptibility $\left(\chi_m\right)$ of diamagnetic substance will be negative. While in the case of para and ferromagnetic substances, diamagnetic susceptibility is positive.