Discussion
For a closed section under pure torsion, the shear flow around the wall is
Answer: B
Correct answer: Constant, even where the thickness varies
Equilibrium of a small element of wall requires the shear flow \( q = \tau t \) to be the same everywhere round the cell, since any variation would leave an unbalanced axial force. The stress is therefore not constant: it is \( q/t \), and it is largest exactly where the wall is thinnest.
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