Q. The stress-strain graph for a metal wire is as shown in the figure. In the graph, the region in which Hooke’s law is obeyed, the ultimate strength and fracture points are represented byPhysics Question Image

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Solution:

In the region , the graph is linear showing that stress is proportional to the strain. Thus, in this region Hooke’s law is obeyed.
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The point on the graph is known as ultimate tensile strength.
The point on the graph is known as fracture point.