NEET 2020 Physics Temperature Dependence of Resistance MCQ Question
The solids which have the negative temperature coefficient of resistance are :
semiconductors only
insulators and semiconductors
metals
insulators only
Correct Answer
Detailed Explanation
Both semiconductors and insulators have a negative temperature coefficient of resistance — their resistance decreases as temperature increases. In semiconductors, increased thermal energy promotes more electrons to the conduction band. In insulators, a similar mechanism occurs at high temperatures. Metals have a positive temperature coefficient. The correct answer is B (insulators and semiconductors).
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