A) each of these decreases
B) copper strip increases and that of germanium decreases
C) copper strip decreases and that of germanium increases
D) each of the above increases
Correct Answer: C
Solution :
Germanium is semi-conductor, whereas copper is conductor. For conductors, \[R\propto \Delta T\] where, \[\Delta T\] is change of temperature. For semi-conductors, \[R\propto \frac{1}{\Delta T}\] Hence, when both are cooled, then resistance of copper decreases whereas that of germanium increases.
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