A) each of these decreases
B) copper strip increases and that of germanium decreas.es
C) copper strip decreases and that of germanium increases
D) each of the above increases
Correct Answer: C
Solution :
| [c] 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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