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Two exactly similar wires of steel (Y=20...

Two exactly similar wires of steel `(Y=20 xx 10^11 dy//cm^2)` and copper `(Y=12xx10^11dy//cm^2)` are stretched by equal forces. If the total elongation is 1cm elongation of copper wire is

A

`3//5cm`

B

`5//3cm`

C

`3//8cm`

D

`5//8cm`

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The correct Answer is:
4
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