Constantan wire is used for making standard resistance, because it has

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High melting point

Low specific resistance

High specific resistance

Negligible temperature coefficient of resistance

answer is D.

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Detailed Solution

Concept: Temperature coefficient of resistance is the measure of rise in electric resistance per unit change in temperature.
Constantan is an alloy which is made up of copper and nickel. It is basically used in eureka and ferry. The composition of constantan is 55% copper and 45% nickel. It has a low value of thermal variation of resistivity.
The resistivity of constantan changes very minutely according to the temperature which makes the values of resistivity constant.
Hence , the correct answer is option 4.

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