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Electrical resistance of certain materials, known as superconductors, changes abruptly from a nonzero value to zero as there is lowered below a critical temperature `T_(C)(0)`. An interseting property of supercoductors 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)` on B si shown in the figure. A superconductor has `T_(C) (0)=100K`. When a magnetic field of 7.5 Tesla is applied , its `T_(C)` decreases to 75 . For this material one can definitely say that when :A. B=5 Tesla, `T_(C)(B)=80K`B. B=5 Tesla,`75K lt T_(C)(B) lt 100K`C. B=1 Tesla, `75K lt T_(C)(B) lt 100 K`D. B=10 Tesla, `T_(C)(B)=70K` |
| Answer» Correct Answer - B | |