which material has a negative temperature coefficient of resistance
a. copper
b. aluminium
c. silver
d. PVC
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Answer:
( a ) copper is d correct answer
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PVC has a negative temperature coefficient of resistance (Option d)
- Temperature coefficient of resistance is defined as the resistance change per degree of temperature change. It is negative when the value of resistance increases with the increasing temperature.
- Among the given substances, copper, silver, and aluminum are pure metals and their coefficient is positive. But PVC (Poly Vinyl Chloride) is a good insulator, so has a negative temperature coefficient of resistance.
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