On increasing the temperature of a conductor, its resistance increases because
A
Relaxation time decreases
B
Mass of the electrons increases
C
Electron density decreases
D
None of the above
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A
Relaxation time decreases
a (a) Resistance of conductor depends upon relation as $R \propto \frac{1}{\tau }$. With rise in temperature rms speed of free electron inside the conductor increase, so relaxation time decrease and hence resistance increases
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