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
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(a) $l = \frac{{FL}}{{AY}}$ $\Rightarrow$ $l \propto \frac{1}{{{r^2}}}$ $(Y, L$ and $F$ are constant$)$
i.e. for the same load, thickest wire will show minimum elongation. So graph $D$ represent the thickest wire.
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