At temperatures near absolute zero,
Bc
approaches 0.142 T for vanadium, a type-I superconductor. The normal phase of vanadium has a magnetic susceptibility close to zero. Consider a long, thin vanadium cylinder with its axis parallel to an external magnetic field $$\vec{B}{0}
inthe+x−direction.,bysymmetry,−axis .,
\vec{B}
andthemagnetization
\vec{M}
(farfromtheends)for(a)
\vec{B}{0}=(0.130 \mathrm{T}) \hat{i}
and(b)
\vec{B}_{0}=(0.260 \mathrm{T}) \hat{i}$$?