Question

The relative permeability is represented by ${\mu }_r$ and the susceptibility by $\chi$ for a magnetic substance. Then for a paramagnetic substance.

• A. ${\mu }_r>1,\chi <0$
• B. ${\mu }_r>1,\chi >0$
• C. ${\mu }_r<1,\chi <0$
• D. ${\mu }_r<1,\chi >0$

Answer 1

The correct option is D ${\mu }_r<1,\chi >0$

Paramagnetic substances are weakly attracted by the external magnetic field lines.

Magnetic susceptibility of paramagnetic substances is small but positive i.e. $\chi >1$

Relative permeability ${\mu }_r=(1+\chi )>1$