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 coeff. Of resistivity of silver.

Explanation

For silver wire, `R_(1) = 2.1 Omega, t_(1) = 27.5^(@)C`
`R_(2) = 2.7 Omega, t_(2) = 100^(@)C, alpha = ?`
`alpha = (R_(2) - R_(1))/(R_(1)t_(2) - R_(2) t_(1)) = (2.7 - 2.1)/(2.1 xx 100 - 2.7 xx 27.5)`
`= (0.6)/(210 - 74.25) = (0.6)/(135.75)`
`:.` Temperature coefficient of resistivity
`prop = 0.443 xx 10^(-2)// .^(@)C`