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(C) The temperature coefficient of resistance $(\alpha)$ is defined by the relation $R_t = R_0(1 + \alpha \Delta T)$.For metallic conductors, such as

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Copper

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(C) The temperature coefficient of resistance $(\alpha)$ is defined by the relation $R_t = R_0(1 + \alpha \Delta T)$.For metallic conductors, such as $Copper$, the resistance increases with an increase in temperature, which implies that the temperature coefficient of resistance $(\alpha)$ is positive.In contrast, semiconductors like $Carbon$ and $Germanium$, as well as electrolytes, exhibit a decrease in resistance with an increase in temperature, resulting in a negative temperature coefficient of resistance.

The positive temperature coefficient of resistance is for

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