By increasing the temperature, the specific resistance of a conductor and a semiconductor

Options

A. Increases for both.
B. Decreases for both.
C. Increases for a conductor and decreases for a semiconductor.
D. Decreases for a conductor and increases for a semiconductor.

Answer

C

Explanation

We know that:
`rho_(T)=rho_(0)(1+alpha DeltaT)` where `alpha` is the temperature coefficient of resistivity. For a conductor a is positive but for a semiconductor a is negative. Hence on increasing temperature the resistivity of conductor increases. While that of a semiconductor decreases.