An eccentric force P is applied as shown to a steel bar of 25 × 90-mm cross section. The strainsat A and B have been measured and found to be \varepsilon_{\mathrm{A}}=+350 \mu \quad \varepsilon_{B}=-70 \mu \text { Knowing that } E=200 \mathrm{GPa} \text {, determine }(a) \text { the distance } d,(b) \text { the magnitude of the force P. }