UPSC Civil Service Exam Questions - Civil Engineering Questions and Answers

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A bar of elastic material is subjected to a direct compressive stress σ₁ in the longitudinal direction. Suitable lateral compressive stress σ₂ is applied along each of the other two lateral directions to limit the net strain in each of the lateral directions to half the magnitude of what it could be under σ₁ acting alone. If μ is the Poisson's ratio of the material, then the magnitude of σ₂ is