We know, Y=FLAl=FLA4-L
⇒1.3×1010=15×9.8×L2×10-6×4-L ⇒4-LL=5.6538×10-3
⇒4L-1=5.6538×10-3 ∴L=3.9775 m
∴ দৈর্ঘ্য সংকুচিত হয়=4-3.9775m=0.0225 m=22.5 mm Ans.
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