Find the resistance of a copper coil of total wire-length 10m and area of cross section 1.0mm^(2). What would be the resistance of a similar coil of aluminium? The resistivity of copper `=1.7xx10^(-8)(Omega)m` and that of aluminium`2.6xx10^(-8)(Omega).`

Explanation

The resistance of the copper coil is
`(rho)(l/A)=((1.7xx10^(-8)(Omega)m)xx10m)/(1.0xx10^(-6)m^(2))=0.17(Omega)`.
`The resistance of the similar aluminium coil will be
`((2.6xx10^(-8)(Omega)m)xx10m)/1.0xx10^(-6)m^(2))=0.26(Omega).`