Question

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

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

Answer 1

The correct option is A Elasticity of wire $P$ is minimum

$\begin{array}{c}\text{As stress is shown on}x-axis\text{and strain on}y-axis\\ \text{so we can say that modulus of elasticity}\\ k=\cot \theta =\frac{1}{\tan \theta }=\frac{1}{\text{slope}}\end{array}$

$\begin{array}{c}\text{So elasticity of wire P is minimum and elasticity of}\\ \text{wire R is maximum.}\end{array}$