Two identical circular rods of same diameter and same length are subjected to same magnitude of
axial tensile force. One of the rod is made of mild steel having the modulus of elasticity of 206
GPa. The other rod is made of cast iron having the modulus of elasticity of 100 GPa. Assume both
the materials to be homogeneous and isotropic and the Axial force causes the same amount of
uniform stress in both the rods. The stresses developed are with in the proportional limit of the
respective materials. Which of the following observations is correct?
(a) Both rods elongate by the same amount
(b) Mild steel rod elongates more than the cast iron
(c) Cast iron rod elongates more than the mild steel rod
(d) As the stresses are equal strains are also equal in both the rods