As the temperature increases, the electrical resistance:
1. decreases for conductors but increases for semiconductors.
2. increases for both conductors and semiconductors.
3. decreases for both conductors and semiconductors.
4. increases for conductors but decreases for semiconductors.
Subtopic:  Energy Band theory |
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The solids which have the negative temperature coefficient of resistance are:

1. insulators only
2. semiconductors only
3. insulators and semiconductors
4. metals
Subtopic:  Energy Band theory |
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