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 '∆l'. Which of thefollowing graphs is a straight line?
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a
∆l versus1l
b
∆l versus l2
c
∆l versus 1l2
d
∆l versus l
answer is B.
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Detailed Solution
Y=A∆ll⇒∆l=FlAY But V=Al So A=Vl Therefore , ∆l=Fl2VY∞l2