For metals,is the temperature coefficient of | vedclass

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(A) The resistivity of a metal is given by the relation $\rho_T = \rho_0 [1 + \alpha(T - T_0)]$,where $\rho_T$ is the resistivity at temperature $T$,$

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Positive

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(A) The resistivity of a metal is given by the relation $\rho_T = \rho_0 [1 + \alpha(T - T_0)]$,where $\rho_T$ is the resistivity at temperature $T$,$\rho_0$ is the resistivity at reference temperature $T_0$,and $\alpha$ is the temperature coefficient of resistivity.In metals,as the temperature increases,the thermal vibrations of the lattice ions increase,which leads to more frequent collisions of electrons with the ions.This results in an increase in the resistance and resistivity of the metal with an increase in temperature.Since $\rho_T > \rho_0$ for $T > T_0$,the value of $\alpha$ must be positive.Therefore,for metals,the temperature coefficient of resistivity is positive.

For metals,is the temperature coefficient of resistivity positive or negative?

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