How does temperature affect the resistivity of insulators?

1.	How does temperature affect the resistivity of insulators?
Answer» In case of insulator, there is a large energy gap between the two bands. So, if the temperature rise is high, the electrons will go to the upper band. But since it is not crowded due to less number of electrons, so the conductance will increase due to availability of free electrons in the conduction band. So, the resistance decreases with increase in temperature in insulator.

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How does temperature affect the resistivity of insulators?

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