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The figure below shows a steel rod of 25 mm² cross sectional area. It is loaded at four points. K, L, M and N. Assume Esteel = 200 GPa. The total change in length of the rod due to loading is
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- 1μm
- –10μm
- 16μm
- –20μm
Correct Option: B
Total change in length
| = |  pl | = | |
| AE | AE |
| = | 100 × 0.5 | + | + | ||
| AE | AE | AE |
| = | [50 - 120 + 20] | |
| 25 × 10-6 × 200 × 109 |
= –1 × 10-5 m = –10μm
