Question

why the resistivity of conducter increase with temperature?​

Answer 1

Answer:

When the temperature of metallic conductor increases, the velocity of free electrons increases but it also cause increase in amplitude of vibration of metallic atoms which cause some extra resistance in the path of free electron. Hence resistance increases with increase in the temperature.

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Answer 2

Answer:

resistivity of a conductor depends upon temperature

Explanation:As temp increases the drift velocity also increases so relaxation time decreases and we know resistivity=$\frac{mass}{n* relaxation time *e^{2} }$ so if relaxation time decreases resistivity increases.