Question

The standard resistance coil are made of "manganin" because

• A. Temperature coefficient of resistance is moderate
• B. Temperature coefficient of resistance remain constant
• C. Temperature coefficient of resistance is very high
• D. Temperature coefficient of resistance is very low

Answer 1

The correct option is D

Temperature coefficient of resistance is very low

For manganin, the temp coefficient of resistance is very low, and its resistivity is quite large. Due to which the resistance of the manganin wire remains almost unchanged with change in temperature. It is due to this fact; the wire of the manganin is used for making standard resistance coil.