Assume a horizontal beam with a square cross section where a vertial force is applied at the midpoint of the beam.  Which one of the following statements is true ? a) Both top and bottom surface of the beam are under compressive bending stresses b) Both top and bottom surface of the beam are under tensile bending stresses c) Maximum bending stress passes through the centroid axis of the beam d) There is no bending stress at the centro

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