Question

In the graphs below, the resistance R of a superconductor is shown as a function of its temperature T for two different magnetic fields (solid line) and (dashed line). If is larger than , which of the following graphs shows the correct variation of R and T in these fields?

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A

option
B

option
C

option
D

option
Hard
Updated on : 2022-09-05
Solution
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Correct option is A)

Resistance usually varies directly with temperature.
But when considering superconductors, the least temperature is Tc(0).
In presence of B, Tc decreases. But that doesn't say anything about general R and T relation.
Only info we have is Tc() < Tc() if . (from observing the graph) 

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