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

Q.

On stretching a wire of Young's modulus $Y$ having original length $L$ by an amount $l$ using a force $F$, the elastic energy stored per unit volume is

Q. The elastic energy stored per unit volume in a stretched wire is

Q. If force $F$ is applied for stretching a wire of length $L$ by $\Delta L$, then elastic potential energy stored per unit volume is
($A$ is cross sectional area of wire)

Q. A wire of initial length $L$ and radius $r$ is stretched by a length $l$. Another wire of same material but with initial length $2L$ and radius $2r$ is stretched by a length $2l$. The ratio of the stored elastic energy per unit volume in the first and second wire is,

Q.

On stretching a wire of Young's modulus $Y$ having original length $L$ by an amount $l$ using a force $F$, the elastic energy stored per unit volume is