Why constantan and manganin which have moderate resistivity and are independent of temperature are used for making standered resistances, resistances for resistance boxes and reheostats ?

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Solution

The reasons for using constantan and manganin are:
1. The variation of resistivity with temperature is very small and,
2. The resistivity of constantan and manganin is very high and any desired resistance can be made with convenient dimensions of the material.

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