On stretching a wire, the elastic energy stored per unit volume is
A$Fl/2AL$
B$FA/2L$
C$FL/2A$
D$FL/2$
Medium
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A$Fl/2AL$
a (a) Energy stored per unit volume $=$ $\frac{1}{2}\left( {\frac{F}{A}} \right)\;\left( {\frac{l}{L}} \right)$ $=$ $\frac{{Fl}}{{2AL}}$
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