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

3/5cm

5/3cm

3/8cm

5/8cm

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