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Q.
The load-versus-elongation graph for four wires of the same material is shown in the figure. The thickest wire is represented by the line
Mechanical Properties of Solids
Solution:
$l=\frac{F L}{A Y} $
$\therefore l \propto \frac{1}{r^{2}} $
$(Y, L$ and $F$ are constant)
i.e. for the same load, the thickest wire will show minimum elongation.
So, graph $D$ represents the thickest wire.
