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The posisson's ratio of material is 0.4....

The posisson's ratio of material is `0.4`. If a force is applied to a wire of this material, then therre si a decreases of cross-sectional area by `2%` . The percentage incrases in its length is

A

`3%`

B

`2.5%`

C

`1%`

D

`0.5%`

Text Solution

Verified by Experts

The correct Answer is:
B
`(Delta l)/(l) = ((Delta r//r))/(sigma) , (Delta A)/(A) = 2(Delta r)/(r)`
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