Q.

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

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a

relaxation time decreases

b

mass of the electrons increases

c

electron density decreases

d

None of the above

answer is A.

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Detailed Solution

Resistance of conductor depends upon relaxation time as R ∝ 1τ. 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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On increasing the temperature of a conductor, its resistance increases because