On stretching a wire,the elastic energy store | vedclass

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Question

(A) The elastic potential energy stored in a stretched wire is given by the work done in stretching it.Work done $W = \frac{1}{2} 	imes 	ext{Force}

Vedclass · Accepted Answer

$Fl/2AL$

Vedclass · Answer

(A) The elastic potential energy stored in a stretched wire is given by the work done in stretching it.Work done $W = \frac{1}{2} 	imes 	ext{Force} 	imes 	ext{Extension} = \frac{1}{2} F l$.The volume of the wire is $V = A 	imes L$,where $A$ is the cross-sectional area and $L$ is the original length.Energy stored per unit volume $u = \frac{W}{V} = \frac{\frac{1}{2} F l}{A L} = \frac{Fl}{2AL}$.

On stretching a wire,the elastic energy stored per unit volume is

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