The susceptibility ($X_m$) and permeability (μ) of a perfectly diamagnetic substance are:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → $X_m=-1$ and $μ=0$
for a perfect diamagnetic substance, $X_m=-1$
and,
Magnetic permeability, $μ=μ_0(1+X_m)$
$=μ_0(1-1)=0$