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Two wires of same radius and length are ...

Two wires of same radius and length are subjected to the same load. One wire is of steel and the other is of copper. It the Young's modulus of steel is twice that of copper, the ratio of elastic energy stored per unit volume in steel to that of copper wire is

A

`1:2`

B

`2:1`

C

`1:4`

D

`4:1`

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