Question

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

• A. O D
• B. O C
• C. O B
• D. O A

Answer 1

Answer: (A)

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