1. The problem statement, all variables and given/known data 2. Relevant equations Young's Modulus, E=σ/ξ Stress,σ =F/A Strain, ξ=x/L 3. The attempt at a solution As diameter and tension are constant, so stress must be constant I assume.. So for the same Young's modulus, if stress is halved, then strain must be halved too I guess. But I don't know what is the extension and length. Do we have to consider the increase in circumference?