Density of rubber is $d$. $ A$ thick rubber cord of length $L$ and cross-section area $A$ undergoes elongation under its own weight on suspending it. This elongation is proportional to
A$dL$
B$Ad/L$
C$Ad/{L^2}$
D$d{L^2}$
Medium
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D$d{L^2}$
d (d) Increment in length $l = \frac{{{L^2}dg}}{{2Y}}$ $\therefore$ $l \propto {L^2}d$
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