Discussion
Assertion (A): A hollow shaft is more efficient in torsion than a solid one of the same weight.
Reason (R): Shear stress in a circular shaft grows in proportion to radius.
Select the correct answer from the options below.
Answer: B
Both are true and the second explains the first. Material near the axis is lightly stressed and contributes little, so removing it and placing the same mass at a larger radius raises the polar second moment substantially. Drive shafts are tubular for exactly this reason.
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