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When a copper wire of area of cross sect...

When a copper wire of area of cross section 1 `mm^(2)` is stretched by a force of 10N. Then the work done per unit volume in stretching the wire is `(Y=1.2xx10^(11)Nm^(-2))`

A

`416.7Jm^(-3)`

B

`208.35Jm^(-3)`

C

`833.4 Jm^(-3)`

D

`316.7 Jm^(-3)`

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