Two wires having same length and materia...

Two wires having same length and material are stretched by same force. Their diameters are in the ratio 1:3. The ratio of strain energy per unit volume for these two wires (smaller to larger diameter) when stretched is

A

`3:1`

B

`9:1`

C

`27:1`

D

`81:1`

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The correct Answer is:

B

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