Discussion
Assertion (A): Torsional rigidity uses the shear modulus rather than Young's modulus.
Reason (R): Torsion deforms the material in shear.
Select the correct answer from the options below.
Answer: B
Both statements are true and the second is the reason for the first. The pairing GJ plays the same part in torsion that EI plays in bending, and confusing the two moduli is a common source of answers wrong by a factor of about 2.6 for metals.
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