Constantan is an alloy composed of:

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Constantan is an alloy composed of:

1. 86% copper, 12% manganese and 2% nickel
2. 76% nickel, 21% chromium, 2% manganese and 1% iron
3. 60% copper and 40% nickel
4. 40% copper, 40% nickel and 20% carbon

Correct Option: C

Constantan is an alloy composed of 60% copper and 40% nickel.