**The diagram represents the stress-strain graph of a loaded wire. Which of these statements is correct?**

- A.
**At I, the wire becomes plastic** - B.
**J is the yield point** - C.
**L is the elastic limit** - D.
**At K. the wire breaks**

**QUICK ANSWER…**

**B**

**DETAILS…**

**If the above diagram represents the behavior of an elastic material, then:**

**Point I is the proportionality limit, it is the point beyond which the material stop obeying Hooke’s law. Also, beyond this point, the material temporarily loses its elasticity and begins to deform.****Point J is the elastic limit or yield point, it is a point beyond which the material enters into plastic region and permanently loses its elasticity. The material may slowly regain its elasticity if it falls between I and J, but anything beyond J is a region of permanent deformation.****Point K is the ultimate stress point, it is a point of maximum stress on the material just before breakage.****Point L is the breaking point, it a point at which the bond closely holding the material together is totally separated and broken.**

**Now for the right answer to the above question:**

**Option A is incorrect. the wire becomes plastic at J and not I.****Option B is correct. yes, J is the yield point or elastic limit.****C is incorrect. L is the breaking point and not the elastic limit.****D is not the correct answer. the wire breaks at L and not K.**

**HELPFUL TIPS…**

**You may please note these/this:**

**Point J is the yield point, a point beyond which the material becomes plastic.**

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**/culled from 2019 JAMB-UTME physics question 23/**