Topic: Strength of Materials
In case of a horizontal beam loaded under bending, the point of inflexion or contra flexure corresponds to a point on the beam, where
- A. Shear force is zero
- B. Bending moment changes its sign
- C. Shear force is maximum
- D. None of the above
Answer: B. Bending moment changes its sign
Explanation: The point of inflexion, also known as the point of contra-flexure, explicitly corresponds to a point on a loaded beam where the bending moment changes its sign (passes through zero), indicating a change in the curvature of the beam.