Use the finite element method to determine the axial force \(P\) in each portion, \(A B\) and \(B C\), of the uniaxial bar. What are the support reactions? Assume: \(E=100 \mathrm{GPa}\), the area of cross sections of the two portions \(A B\) and \(B C\) are, respectively, \(10^{-4} \mathrm{~m}^{2}\) and \(2 \times 10^{-4} \mathrm{~m}^{2}\), and \(F=\) \(10,000 \mathrm{~N}\). The force \(F\) is applied at the cross section at \(B\).

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A RL 0.25 m B C F 0.4 m RR