Fundamentholfundamenthol
NEET2022Physics
Q.

As the temperature increase, the electrical resistance :

  1. A

    decreases for both conductors and semiconductors

  2. B

    increases for conductors but decreases for semiconductors

  3. C

    decreases for conductors but increase for semiconductors

  4. D

    increases for both conductors and semiconductors.

Solution

Metallic conductors have a positive temperature coefficient of resistance; lattice vibrations grow with temperature and scatter electrons more strongly, so resistance rises.

Semiconductors have a negative temperature coefficient; rising temperature liberates additional charge carriers across the band gap, so resistance falls.

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