Question

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

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

Answer 1

The correct option is D None of the above is true

Draw a diagram of given problem.


Calculate elasticity of wires
As given in situation,
stress is along x−axis and strain are along x−axis which is generally opposite to each other because stress is along
y axis and strain is along x axis. Therefore,
but due to opposition it is $Y=\cot \theta$
i.e., $Y=1/\tan \theta$
Therefore, elasticity of 𝑃 is minimum and for 𝑅 is maximum.