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From among the given options, Poisson’s ratio is the highest for:
1. wood
2. rubber
3. iron
4. copper

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Correct Answer - Option 2 : rubber


Poisson's ratio:

Poisson's ratio is the ratio of lateral strain to longitudinal strain. Mathematically is given by,

\(μ = -\frac{Lateral\ strain}{Longitudinal \ Strain}\)

A negative sign in the formula is to make the ratio positive.

Material Poisson's Ratio (μ)
Gold 0.44
Magnesium 0.35
Copper 0.33
Rubber 0.4999
Steel 0.30
Concrete 0.20
iron 0.21-0.29
Wood 0.18-0.43

The Poisson ratio is the property of the material. 

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