$A$ wire of length $L$ and area of cross-section $A$ is made of a material with Young's modulus $Y$. It is stretched by an amount $x$. The work done in stretching the wire is:
- A$\frac{Y x^2 A}{2 L}$
- B$\frac{2 Y x^2 A}{L}$
- C$\frac{Y x A}{2 L}$
- D$\frac{Y x^2 A}{2}$
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