Electrical resistance of certain materials , known as superconduct | Filo

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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 . An interesting property of superconductors is that their critical temperature becomes smaller than if they are placed in a magnetic field, i.e., the critical temperature is functional of the magnetic field strength B. the dependence of (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 (solid line) and (dashed line). if is larger than , which of the following graphs shows the correct variation of R with T in these fields ?

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