Question

In the case of insulators, as the temperature decreases, resistivity
(a) decreases
(b) increases
(c) remains constant
(d) becomes zero

Answer 1

In the case of insulators , forbidden energy gap between the conduction band and the valance band is high. and forbidden energy is more than 3eV for insulators . So, large amount of energy is required to move electrons from valance band to conduction band. So, if we increase the temperature, atoms of insulator vibrates and electrons moves from valance band to conduction band. Due to this conductivity of insulator increases. Since, resistivity decreases.

So, when we increase temperature in case of insulators , resistivity decreases and when we decrease the temperature , resistivity increases.
Hence, option (b) is correct

Answer 2

Answer:

When the temperature increases the resistivity decreases...and vice versa... So for the give question answer is (b)

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