Question

The stress-strain curves for three wires of different materials are shown in figure, where $P,Q$ and $R$ are the elastic limits of the wires. The figure shows that

• A. Elasticity of wire $P$ is maximum
• B. Elasticity of wire $Q$ is maximum
• C. Elasticity of wire $R$ is maximum
• D. None of the above is true

Answer 1

The correct option is C Elasticity of wire $R$ is maximum

As stress is shown on x-axis and strain y-axis.
So, we can say that $Y=\cot \theta =\frac{1}{\tan \theta }=\frac{1}{slope}$
So, elasticity of wire $P$ is minimum and of wire $R$ is maximum.