First slide

Temperature dependence

Question

A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of

Easy

A

each of these increases
B

each of these decreases
C

copper strip increases and that of germanium decreases
D

copper strip decreases and that of germanium increases

Solution

For conductors, Resistance $\propto$ Temperature and for semiconductors, $Resistance \propto \frac{1}{Temperature}$

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