Physics-
General
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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 subscript c end subscript (0). An interesting property of superconductors is that their critical temperature becomes smaller than T subscript c end subscript (0) if they are placed in a magnetic field, i.e., the critical temperature T subscript c end subscript (B) is a function of the magnetic field strength B. The dependence of T subscript c end subscript (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 subscript 1 end subscript (solid line) and B subscript 2 end subscript (dashed line). If B subscript 2 end subscript is larger than B subscript 1 end subscript , which of the following graphs shows the correct variation of R with T in these fields?

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The correct answer is:

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