Two wires (one is made of steel and other is made of copper) having same length, same diameter and subjected to the same axial load. What will be the ratio of extension of the copper wire to the extension of the steel wire? [Ratio of the 'Young's modulus of steel' to the 'Young modulus of copper' = \(\frac{5}{3}\)]
1
\(\frac{3}{5}\)
2
\({\left( {\frac{5}{3}} \right)^2}\)
3
\({\left( {\frac{3}{5}} \right)^2}\)
4
\(\frac{5}{3}\)