alleryThe Poisson's ratio of a material is defined as
Alongitudinal strain / lateral strain
B-(lateral strain / longitudinal strain)
Cshear strain / longitudinal strain
Dvolumetric strain / longitudinal strain
Answer & Solution
Correct answer: B. -(lateral strain / longitudinal strain)
$\sigma = -\dfrac{\varepsilon_{\text{lateral}}}{\varepsilon_{\text{longitudinal}}}$.
The minus sign makes $\sigma$ positive for normal materials, since a wire stretched longitudinally contracts laterally.
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