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A wire (Y=1xx10^(11)N//m) has length 1m ...

A wire `(Y=1xx10^(11)N//m)` has length 1m and area `1mm^(2)`. The work required to increase its length by 2mm is

A

`5xx10^(-2)J`

B

`5xx10^(-3)J`

C

`5xx10^(-4)J `

D

`5xx10^(-5)J`

Text Solution

Verified by Experts

The correct Answer is:
A
`W=(1)/(2) (yAl^(2))/(L)`
`=(1)/(2) xx (2xx10^(11) xx 10^(-4) xx10^(-8))/(2) =0.5 xx 10^(-1)`
`=5 xx 10^(-2)J`
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