Electrical resistance of certain materials , known as superconductors , changes abruptly from a nonzero 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 functional of the magnetic field strength B. the dependence of $T_{c}$ (B) on B is shown in the figure.

In the graphs below, the resistance R of a superconductor is shown as a function of its temperature T for two different magnetic fields $B_{1}$ (solid line) and $B_{2}$ (dashed line). if $B_{2}$ is larger than $B_{1}$ , which of the following graphs shows the correct variation of R with T in these fields ?

Question

Electrical resistance of certain materials , known as superconductors , changes abruptly from a nonzero 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 functional of the magnetic field strength B. the dependence of

T_{c}

(B) on B is shown in the figure.

In the graphs below, the resistance R of a superconductor is shown as a function of its temperature T for two different magnetic fields

B_{1}

(solid line) and

B_{2}

(dashed line). if

B_{2}

is larger than

B_{1}

, which of the following graphs shows the correct variation of R with T in these fields ?

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