Physics - Magnetism Question with Solution | TestHub

Paragraph:Electrical resistance of certain materials, known as superconductors, changes abruptly from a non-zero value to zero as their temperature is lowered below a critical temperature $T_C(0)$. An interesting property of superconductors is that their critical temperature becomes smaller than $T_C(0)$ if they are placed in a magnetic field i.e., the critical temperature $T_C(B)$ is a function of the magnetic field strength $B$. The dependence of $T_C(B)$ on $B$ is shown in the figure.
Question:A superconductor has $T_C(0)=100\mathrm{K}$. When a magnetic field of $7.5$ Tesla is applied, its $T_C$ decreases to $75\mathrm{K}$. For this material one can definitely say that when (Note : $\mathrm{T}$ = Tesla)