A) \[{{L}^{2}}Dg/E\]
B) \[{{L}^{2}}Dg/2E\]
C) \[{{L}^{2}}Dg/4E\]
D) \[L\]
Correct Answer: B
Solution :
Elongation in a card by its own weight, which act at the centre of gravity of the card. Force \[F=mg=V\text{ }Dg=ALDg\] Elongation of length, \[l=\frac{FL/2}{YA}\] \[\frac{{{L}^{2}}Dg}{2EA}=\frac{{{L}^{2}}Dg}{2E}\]You need to login to perform this action.
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