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A 4m long copper wire of cross sectional...

A `4m` long copper wire of cross sectional are a`1.2cm^(2)` is strechted by a force of `4.8xx10^(3)N`.
if Young's modulus for copper is `Y = 1.2xx10^(11) M//m^(2)` , the increases in length of wire and strain energy per unit volume are

A

`1.32xx10^(-4)m, 66xx10^(3)J`

B

`132xx10^(-4)m, 66xx10^(2)J`

C

`1.32xx10^(-4)m, 6.6xx10^(3)J`

D

`0.132xx10^(-4)m, 66xx10^(4)J`

Text Solution

Verified by Experts

The correct Answer is:
C
`(E)/(V) = (1)/(2) ("stres") xx ("strain"), E = (F)/(A) xx (l)/(Y)`
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