The magnetic field lines are completely expelled from a material when ($\chi$ is the susceptibility and $\mu_{r}$ is relative permeability)
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → $\chi=-1$ and $\mu_{r}=0$
$\mu_{r}=1+\chi$
and, Magnetic field lines are completely expelled from a material when relative permeability is equal to 0.
$⇒ 0 = 1+\chi$ [No. magnetic field lines]
$\chi=-1$