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$$M_B=\cfrac{d_3^2\cdot F_A\cdot10^3\cdot ψ\cdot \sqrt{E\cdot π}}{8\cdot \sqrt{F_A\cdot10^3}\cdot\tanh{\left(\cfrac{8\cdot l}{d_3^2}\cdot\sqrt{\cfrac{F_A\cdot10^3}{E\cdot π}}\right)}\cdot 10^3}$$