The figure shows an elastic beam of constant flexural rigidity EI and length L. The transverse deflection y(x) for the beam is represented by the equation \(y(x) = \frac{{{M_o}}}{{4EIL}}x^2\left[ {{x} - {}L} \right]\;\), where Mo is the applied couple. If L = 100 mm and Mo = 100 N-mm, then the magnitude of the shear force (in N) at the middle of the beam (at x = L/2) is ________
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