Is it true that the alloys like manganin or constantan are used in making standard resistance coils?

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True

False

answer is A.

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Detailed Solution

The above statement is True.
Both Manganin and Constantan are alloys. The resistivity of manganin is

44 \times 1 0^{- 6} Ωm

and the constantan is

49 \times 1 0^{- 6}

Ω m

Therefore, their resistivity is generally higher than that of its constituent metals. As a result, they do not oxidise or burn readily at high temperatures. So we use them in making standard resistance coils.

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