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Electrical resistance of certain materia...

Electrical resistance of certain materials, known as superconductors, changes abruptly from a nonzero value of zero as their temperature is lowered below a critical temperature `T_(C) (0)`. An interesting property of super conductors is that their critical temperature becomes smaller than `T_(C) (0)` if they are placed in a magnetic field, i.e., the critical temperature `T_(C) (B)` is a function of the magnetic field strength B. The dependence of `T_(C) (B)` on B is shown in the figure.
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A superconductor has `T_(C) (0) = 100 K`. When a magnetic field of 7.5 Tesla is applied , its `T_(C)` decreases to 75 K. For this material one can difinitely say that when

A

`B=5 "Tesla" , T_(c)(B)=80 K`

B

B=5 Tesla, `75 k lt T_(c)(B) lt 100 K`

C

B=5 Tesla, `75 k lt T_(c)(B) lt 100 k`

D

`B=10 "Tesla" , T_(c)(B)=70 K`

Text Solution

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The correct Answer is:
B
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A superconductor has T_c(0)=100K . When a magnetic field of 7*5tesla is applied, its T_c decreases to 75K . For this material, one can definitely say that when

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