Question

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

(a) B = 5T,T_C(B) = 80K

(b) B = 5T, 75K < T_C(B) < 100K

(c) B = 10T, 75K < T_C(B) < 100K

(d) B = 10T, T_C(B) = 70K

Answer 1

With increase in temperature, TC is decreasing.

T_C(0) = 100K

T_C = 75 K at B = 7.5 T

Hence, at B = 5 T, TC should lie between 75 K and 100 K.

Hence, the correct option should be (b).