Question

For which metal resistance decreases on increasing temperature

Answer 1

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Therefore at high temperatures the resistance of an insulator can fall, and in some insulating materials, quite dramatically. In a material where the resistance INCREASES with an increase in temperature, the material is said to have a POSITIVE TEMPERATURE COEFFICIENT.

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Answer 2

All metals and insulators have positive temperature coefficient (PTC) ie. their resistance decreases with increase in temperature while semiconductors have negative temperature coefficient (NTC). Aluminium , copper are few metals with PTC