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. $\text{Elasticity of wire P is maximum}$
• B. $\text{Elasticity of wire Q is maximum}$
• C. $\text{Elasticity of wire R is minimum}$
• D. $\text{None of the above is true}$

Answer 1

The correct option is D $\text{None of the above is true}$

As stress is shown on $x-$ axis and strain on $y-$ axis
So we can say that Young's modulus;$Y=\text{cot}\theta =\frac{1}{\text{tan}\theta }=\frac{1}{\text{Slope}}$
Elasticity $\propto$ $Y$
So the elasticity of wire $\text{P}$ is minimum and of wire $\text{R}$ is maximum