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Magnetism question

2010 · Shift 1 · Q76
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Magnetism question

2010 · Shift 1 · Q76

JEE AdvancedPhysicsMagnetismMCQ+3 / −1
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. IIT-JEE 2010 Paper 1 Offline Physics - Magnetism Question 15 English ComprehensionA superconductor has Tc(0) = 100 K. 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
  1. A
    B = 5 T, Tc(B) = 80 K
  2. B
    B = 5 T, 75 K c (B) < 100 K
  3. C
    B = 10 T, 75 K c < 100 K
  4. D
    B = 10, Tc = 70 K
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