A copper wire and a steel wire of the same diameter and length are connected end to end and a force is applied, which stretches their combined length by 1 cm. The twowires will have

Stress = Force  Area In the present case, force applied and area of cross-section of wires are same, therefore stress has to be the same. Strain = Stress YSince the Young's modulus of steel wire is greater than the copper wire, therefore, strain in case of steel wire is less than that in case of copper wire. so different strains.