alleryPoisson's ratio σ for a stretched rod relates:
ATensile to shear
BMass to length
CStress to area
DLateral strain to longitudinal strain (typically 0 to 0.5)
Answer & Solution
Correct answer: D. Lateral strain to longitudinal strain (typically 0 to 0.5)
σ = -ε_lateral/ε_long.
For most materials 0.25–0.35. Cork: ≈ 0. Rubber: ≈ 0.5 (volume-preserving).
σ < 0.5 implies positive volume change under stretching.
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