The resistance of carbon _______ with rise in the temperature.

Increases

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Decreases

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Remains the same

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First increases then decreases

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Solution

The correct option is B Decreases
Since carbon is a semiconductor its temperature coefficient of resistance $(α)$ is negative.

$R = R_{o} [1 + α (T - T_{o})]$

Since $α$ is negative, hence resistance $R$ decreases with increasing value of $T$ .

Answer_(B)

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Similar questions

(a)

(b)

Normally, solubility of a crystalline solid increase with temperature. Does it increase uniformly in all cases ? Name a substance whose solubility :

(a) increase rapidly withe temperature.

(b) increase gradually with temperature.

(d) initially increases then decreases with rise in temperature.

The resistivity of all pure metals increases with a rise in temperature.

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