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  4. The figure shows the stress -strain graph of a certain substance. Over which region of the graph is Hooke's Law obeyed?

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Q. The figure shows the stress -strain graph of a certain substance. Over which region of the graph is Hooke's Law obeyed?Physics Question Image

Mechanical Properties of Solids

Solution:

For Hooke's law, stress $\propto$ strain $i .$ e. , the graph between stress and strain is a straight line, which is so for portion $O$ to $D$.