Which of the following materials is used for making coils of standard resistances ?
A. Copper
B. Nichrome
C. Platinum
D. Manganin
Answer: Option D
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standard resistance coils are made from alloys like manganin and constantan because of their high resistivity and low-temperature coefficient of resistance
Manganin is a trademarked name for an alloy of typically 84% copper, 12% manganese, and 4% nickel. ... Manganin foil and wire is used in the manufacture of resistors, particularly ammeter shunts, because of its virtually zero temperature coefficient of resistance value and long term stability.
Density (ρ): 8.4 g/cm3
Volume resistivity (ρ): 43–48 μΩ⋅cm