Q. On stretching a wire, the elastic energy stored per unit volume is
A) $Fl/2AL$
B) $FA/2L$
C) $FL/2A$
D) $FL/2$
Explanation
(a) Energy stored per unit volume $= \frac{1}{2}\left( \frac{F}{A} \right)\left( \frac{l}{L} \right) = \frac{Fl}{2AL}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.