A silver wire has a resistance of `2.1 Omega` at `27.5^(@)C`, and a resistance of `2.7 Omega` at `100^(@)C`. Determine the temperature coefficient of resistivity of silver.

Explanation

Here `R_(27.5) = 2.1 Omega, R_(100) = 2.7 Omega, alpha = ?`
`alpha = (R_(100) - R_(27.5))/(R_(27.5) xx(100 - 27.5)) = (2.7 - 2.1)/(2.1 xx (100 - 27.5)) = 0.0039^(@)C^(-1)`