Which of the following has a negative tempera | vedclass

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(A) The temperature coefficient of resistance $(\alpha)$ is defined as the fractional change in resistance per unit change in temperature. For metals

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$C$

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(A) The temperature coefficient of resistance $(\alpha)$ is defined as the fractional change in resistance per unit change in temperature. For metals like $Fe$, $Mn$, and $Ag$, the resistance increases with an increase in temperature, resulting in a positive temperature coefficient. For semiconductors and insulators like carbon $(C)$, the number of charge carriers increases significantly with an increase in temperature, which leads to a decrease in resistance. Therefore, carbon $(C)$ has a negative temperature coefficient.

Which of the following has a negative temperature coefficient?

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