MCQ
On stretching a wire, the elastic energy stored per unit volume is
- ✓$F l / 2 A L$
- B$F A / 2 L$
- C$F L / 2 A$
- D$F L / 2$
✓
Answer
Correct option: A.
$F l / 2 A L$
(a) Energy stored per unit volume $=\frac{1}{2}\left(\frac{F}{A}\right)\left(\frac{l}{L}\right)=\frac{F l}{2 A L}$
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