First slide

Elastic Modulie

Question

The increase in length on stretching a wire is 0.05%. If its Poisson's ratio is 0.4, then its diameter

Moderate

A

reduce by 0.02%
B

reduce by 0.1%
C

increase by 0.02%
D

decrease by 0.4%

Solution

Poisson's ratio = $= \frac{Lateral strain}{Longitudinal strain}$
Later strain = $0.4 \times \frac{0.05}{100}$
So, it will be reduced by 0.02 %.

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