Which of the following is correct?
1
Conductors and extrinsic semiconductors have negative temperature coefficient and intrinsic semiconductors have positive temperature coefficient.
2
Insulators and semiconductors have positive temperature coefficient whereas conductors have negative temperature coefficient.
3
Conductors and extrinsic semiconductors have positive temperature coefficient and pure semiconductors have negative temperature coefficient.
4
Intrinsic and extrinsic semiconductors have negative temperature coefficient and conductors have positive temperature coefficient.