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 `T_(C)(0)`. An interesting property of superconductors 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 on B is shown in the figure.

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

Options

A. `B=5` Tesla,`T_(C)(B)=80K`
B. `B=5` Tesla,`75 K ltT_(C)(B) lt100K`
C. `B=10` Tesla,`75 K ltT_(C)(B) lt100K`
D. `B=10` Tesla,`T_(C)(B)=70K`

Answer

B

Explanation

For `{:(B=0,T_(C)=100 k),(B=7.5T,T_(C)=75 k):}`