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?
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?[/B]