Copper of fixed volume V is drawn into w...

Copper of fixed volume V is drawn into wire of length l. When this wire is subjected to a constant force F, the extension produced in the wire is `Delta l`. Which of the following graphs is a straight line?

`Deltal versus (1)/(l)`

`Deltal versus l^2`

`Deltal versus (1)/(l^2)`

`Deltal verus l`

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