If the force constant of a wire is $K,$ the work done in increasing the length of the wire by $l$ is
If the force constant of a wire is $K,$ the work done in increasing the length of the wire by $l$ is
- A
$Kl/2$
- B
$Kl$
- C
$K{l^2}/2$
- D
$K{l^2}$
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