First slide
Hook's Law

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


 As V=Al                                      . . . .(i)

where A is the area of cross - section of the wire.

 Young's modulus, Y=(F/A)(Δl/l)=FlAΔl

Δl=FlYA=Fl2YV  (Using (i)


 Hence, the graph between Δl and l2 is a straight line. 

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