Discussion
The point of contraflexure lies where
Answer: B
The point of contraflexure lies where the bending moment is zero or changes its sign.
Contraflexure is the point where the beam's curvature reverses, from sagging to hogging or the reverse. Since curvature is proportional to bending moment, this happens where the bending moment passes through zero and changes sign, as in overhanging and fixed beams.
A change in the sign of shear force, or zero shear force, marks the point of maximum bending moment, which is the opposite situation, so the shear force options and 'maximum bending moment' are wrong.
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