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 co-efficient of resistivity of silver.

Explanation

Here `R_1 = 2.1 Omega`at temperature `theta_1 =275^@C`
and `R_1 = 2.7 Omega` at temperature `theta_2 = 100^@C`
Temperature coefficient of resistance `=alpha=?`
`alpha=(R_2-R_1)/(R_1(theta_2-theta_1))`
`alpha=(2.7-2.1)/(2.1(100-27.5))`
`alpha = (0.6)/(2.1 xx72.5)`
`alpha = 0.0039^@C^(-1)`