As the temperature increases, the electrical resistance:

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increases for conductors but decreases for semiconductors

decreases for both conductors and semiconductors

increases for both conductors and semiconductors

decreases for conductors but increases for semiconductors

answer is B.

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Detailed Solution

In case of conductor, resistance increases while it decreases in case of semiconductor.

The resistance of a conductor increases with an increase in temperature because the thermal velocity of the free electrons increases as the temperature increases. This results in an increase in the number of collisions between the free electrons.

With increase in temperature a greater number of bonds inside the semiconductor are broken. Hence a large number of electrons come out from those bonds. As a result the number of charge carriers increases and consequently the resistance decreases.

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