The strain-stress curves of three wires of different materials are shown in the figure. $P, Q$ and $R$ are the elastic limits of the wires. The figure shows that
Medium
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(d) As stress is shown on $x-$axis and strain on $y-$axis
So we can say that $Y = \cot \theta = \frac{1}{{\tan \theta }} = \frac{1}{{{\rm{slope}}}}$
So elasticity of wire $P$ is minimum and of wire $R$ is maximum
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