A wire of length L and cross-sectional area A is made of material of Young's modulus Y. The work done in stretching the wire by an amount x is given by

Question

$$\begin {array} {1 1} (a)\;\frac{YAx^2}{L} \\ (b)\;\frac{YAx^2}{2L} \\ (c)\;\frac{YAL^2}{x} \\ (d)\;\frac{YAL^2}{2x} \end {array}$$