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Two wires of the same material and lengt...

Two wires of the same material and length but diameters in the ratio 1 : 2 are stretched by the same force. The potential energy per unit volume for the two wire when stretched will be in the ratio

A

`81: 1`

B

`4:1`

C

`2:1`

D

`1:1`

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The correct Answer is:
A
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