1. The problem statement, all variables and given/known data Under tension T the wire has lenghth of m, its length becomes n when the tension is increase to T'. What is the extra energy stored in the wire as a result of this process? 2. Relevant equations E=1/2 Fe 3. The attempt at a solution Extra energy= E(n)-E(m) = 1/2 x (T'n-Tm) There is no such answer in the multiple choices. Am I wrong when I subtracted the two energy?