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 : 15 of 84

Marks: +1, -0

A superconductor has Tc (0) = 100K. When a magnetic field of 7.5 T is applied, its Tc decreases to 75 K. For this material, one can definitely say that when

[JEE Adv 2010 P1]

B = 5 T , Tc B = 80K
B = 5 T , 75 K < Tc B <100K
B =10 T , 75K < Tc <100K
B = 10, Tc = 70 c K

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