The solids which have the negative temperature coefficient of resistance are: (a) insulators only (b) semiconductors only (c) insulators and semiconductors (d) metals

Answer: (c). Metals: ρ rises with T, so α > 0. Semiconductors and insulators: more carriers are freed at higher T, so ρ falls and α < 0. So the answer is (c) insulators and semiconductors.

The solids which have the negative temperature coefficient of… | NEET 2020 (Phase 1)

Q40NEET 2020 · PHASE 1Easy

Ohm's Law, Resistivity & Temperature

The solids which have the negative temperature coefficient of resistance are:

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Answer: (c)

Metals: $\rho$ rises with $T$ , so $\alpha > 0$ .
Semiconductors and insulators: more carriers are freed at higher $T$ , so $\rho$ falls and $\alpha < 0$ .
So the answer is (c) insulators and semiconductors.

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