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Q. The load versus elongation graph for four wires of same length and the same material is shown in figure. The thinnest wire is represented by linePhysics Question Image

Mechanical Properties of Solids

Solution:

For the same load wire with maximum elongation has minimum cross-section area
image
As $\frac{F L}{A Y}=\Delta x$
$F, L, Y$ are fixed $s o \frac{1}{A} \propto \Delta x$
$\Rightarrow O A$ is the thinnest