NEETPhysicsCurrent Electricity
Paragraph: 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 str
Options
- AB=5 ~T , T_C(B)=80 ~K
- BB=5 ~T , 75 ~K < T_C(B) < 100 ~K
- CB=10 ~T , 75 ~K < T_C(B) < 100 ~K
- DB=10 ~T , T_C(B)=70 ~K
Correct answer
B. B=5 ~T , 75 ~K < T_C(B) < 100 ~K
Step-by-step solution
With increase in temperature, T_C is decreasing. aligned T_C(0) & =100 ~K T_C & =75 ~K at B=7.5 ~T aligned Hence, at B=5 ~T , T_C should lie between 75 ~K and 100 ~K . Hence, the correct option should be (b).