2015 · Q60
A wire-bound standard resistor uses manganin or constantan. It is because
General KnowledgePhysics
- Athese alloys are cheap and easily available
- Bthey have high resistivity
- Cthey have low resistivity
- Dthey have resistivity which almost remains unchanged with temperature
Explanation
Manganin and constantan are used for wire-bound standard resistors because their resistivity remains almost unchanged with temperature — they have a very low temperature coefficient of resistance — keeping the resistance stable. The answer is D.