First slide

Temperature dependence

Question

On increasing the temperature of a conductor, its resistance increases because

Easy

A

relaxation time decreases
B

mass of the electrons increases
C

electron density decreases
D

None of the above

Solution

Resistance of conductor depends upon relaxation time as $R \propto \frac{1}{τ} .$ With rise in temperature rms speed of free electrons inside the conductor increases, so relaxation time decreases and hence resistance increases.

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