Discussion
Assertion (A): The thinnest wall of a closed section under torsion is the critical one.
Reason (R): The shear flow is constant round the cell, so stress varies inversely with thickness.
Select the correct answer from the options below.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. With \( q \) constant round the cell, \( \tau = q/t \) is greatest where \( t \) is least. Thinning one wall to save weight therefore raises the stress in that wall alone and may make it the critical one, however generous the rest of the box.
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