Electrical resistance of certain materials, known as superconductors, changes abruptly from a nonzero value to zero...

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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 T.(0). An interesting property of superconductors is that their critical temperature becomes smaller than T.(0) if they are placed in a magnetic field, i.e., the critical temperature T. (B) is a function of the magnetic field strength B. The dependence of T. (B) on B is shown in the figure. Te (B)4 Tc (0) A3 B 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 (solid line) and B (dashed line). If B is larger than B, which of the following graphs shows the correct variation of R with T in these fields? B A) B) C) RA "JasTM, B B T R 1.1 B B T D) R B T R B 14 B T 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.(0). An interesting property of superconductors is that their critical temperature becomes smaller than T.(0) if they are placed in a magnetic field, i.e., the critical temperature T. (B) is a function of the magnetic field strength B. The dependence of T. (B) on B is shown in the figure. Te (B)4 Tc (0) A3 B 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 (solid line) and B (dashed line). If B is larger than B, which of the following graphs shows the correct variation of R with T in these fields? B A) B) C) RA "JasTM, B B T R 1.1 B B T D) R B T R B 14 B T

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