What is the "swamping" resistance which is connected in series with the working coil of a voltmeter to drastically reduce the error in measurement caused due to variation in temperature is made up of?
- A. Constantan
- B. Eureka
- C. Manganin
- D. Nichrome
Answer: C. Manganin
Explanation: Swamping resistance is made of Manganin, which has an extremely low temperature coefficient of resistance (α ≈ 0), minimising measurement error caused by temperature variation.