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Actually it depends on the material from which the resistor is made, well in general for all practical purposes we choose a material with positive temperature coefficient as we deliberately want to add a resistance to the circuit.

But if we come across some resistors which are made up of materials like Glass, Ceramics, Semiconductors , have negative temperature coefficients (practically not used)

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Q: Does resistor is a negative coefficient of temperature?
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If a carbon resistor increases in temperature its resistance will?

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