Why are constantan or manganin used for making standard resistors?

Resistivities are low & low temperature coefficient of resistance

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Resistivities are high & high temperature coefficient of resistance

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Resistivities are high & low temperature coefficient of resistance

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Resistivities are low & high temperature coefficient of resistance

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Solution

The correct option is C Resistivities are high & low temperature coefficient of resistance
In most of the resistors, high resistance is needed in a small dimension conductor. Hence larger values of resistivity is required.

To avoid variation in resistance, we choose low values of temperature coefficient of resistance.

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Alloys like manganin and constantan are used for making standard resistance coils as they have

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