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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

0.4 J

B

0.8 J

C

4 J

D

400 J

Text Solution

Verified by Experts

The correct Answer is:
A
`W=(1)/(2)F l=(1)/(2) xx (Al^(2))/(L)`
`=(1)/(2) xx (2xx10^(11) xx 10^(-6) xx 4 xx 10^(-6))/(1) =0.4J`.
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