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Q.

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
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