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 $$l$. Which of the following graphs is a straight line ?
$\Delta $$l$ versus 1/$l$
$\Delta $$l$ versus $l$2
$\Delta $$l$ versus 1/$l$2
$\Delta $$l$ versus $l$
Solution
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