IIT JEE Advanced 2010 Paper 1

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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 Tc (0). An interesting property of superconductors is that their critical temperature becomes smaller than Tc(0), if they are placed in a magnetic field, that is, the critical temperature Tc(B) is a function of the magnetic field strength B. The dependence of Tc(B) on B is shown in the figure.

Section: Physics

Question : 14 of 84

Marks: +1, -0

In the graph below, the resistance R of a superconductor is shown as a friction of its temperature T for two different magnetic fields B1 (solid line) and B2 (dashed line). If B2 is larger than B1 which of the following graphs shows the correct variation of R with T in these fields?

[JEE Adv 2010 P1]

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