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A 3 cm long copper wire is stretched t...

A 3 cm long copper wire is stretched to increase its length by 0.3 cm. find the lateral strain in the wire, if the Poisson.s ratio for copper is 0.26.

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L = 3cm, `Delta L = 0.3cm, sigma = 0.26`.
Longitudinal strain `(DeltaL)/(L) = (0.3)/(3) = 0.1`
`sigma ` = Lateral Strain / Longitudinal Strain
The Lateral Strain ` = sigma xx ` Longitudinal Strain
`= 0.26 xx 0.1 = 0.026`
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