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(B) In a stress-strain curve,a material that shows a large plastic deformation before breaking is called ductile,while a material that breaks soon aft

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$A$ is ductile but $B$ is brittle

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(B) In a stress-strain curve,a material that shows a large plastic deformation before breaking is called ductile,while a material that breaks soon after the elastic limit is called brittle.From the given graph,material $A$ shows a significant plastic region (indicated by the curve extending further and showing a yield point) before fracture,which is a characteristic of ductile materials.Material $B$ shows a smaller region of deformation and breaks relatively quickly after the elastic limit,which is a characteristic of brittle materials.Therefore,$A$ is ductile and $B$ is brittle.

The diagram shows the stress versus strain curve for materials $A$ and $B$. From the curves,we can infer that

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