Two wires, P and Q, made of the same material, are stretched with an increasing force.
A graph is plotted of the variation with force of the extension of each wire.
The wires have the same original length but different diameters.
What is the ratio$\frac{{diameter{\text{ }}of{\text{ }}wire{\text{ }}Q}}{{{\text{ }}diameter{\text{ }}of{\text{ }}wire{\text{ }}P}}$?

1 )
$\frac{1}{3}$
2 )
$\frac{1}{\sqrt{3}}$
$\sqrt{3}$
4 )
$3$
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