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  4. 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. He figure shows that

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Q. 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. He figure shows thatPhysics Question Image

Jharkhand CECEJharkhand CECE 2012

Solution:

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}{\text{slope}} $ slope
So, elasticity of wire P is minimum and of wire R is maximum.