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The resistivity of ‘X’ decreases with temperature and its coefficient of resistivity is negative. Identify X.

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in Physics – Class 12 by (135k points)
The resistivity of ‘X’ decreases with temperature and its coefficient of resistivity is negative. Identify X.

(a) Silver

(b) Silicon

(c) Copper

(d) Nichrome

I had been asked this question in an online interview.

My query is from Current Electricity topic in section Current Electricity of Physics – Class 12

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The correct option is (b) Silicon

To explain I would say: The coefficient of resistivity is negative for semiconductors and their resistivity decreases with temperature. The relaxation time does not change with temperature but the number density of free electrons increases exponentially with the increase in temperature. Consequently, the resistivity decreases exponentially with the increase in temperature.

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