A square plate of dimension L X L is subjected to a uniform pressure load P = 250 MPa on its
edges as shown in the figure. Assume plane stress conditions. The Young’s modulus E = 200
GPa.
The deformed shape is a square of dimension L - 2$\delta$. If L = 2 m and $\delta$ = 0.001 m, the Poisson’s
ratio of the plate material is ______________