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The Poisson's ratio of a material is 0.4...

The Poisson's ratio of a material is 0.4. If a force is applied to a wire of this material, there is a decrease of cross-sectional area by 2%. The percentage increase in its length is

A

`3%`

B

`2.5%`

C

`1%`

D

`0.5%`

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The correct Answer is:
B
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