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A copper wire of length 1.0 m and a stee...

A copper wire of length `1.0` m and a steel wire of length` 0.5` m having equal cross-sectional areas are joined end to end. The composite wire is stretched by a certain load which stretches the copper wire by `1 mm.` If the Young’s modulii of copper and steel are respectively `1.0xx10^(11)Nm^(-2)"and"2.0xx10^(11)Nm^(-2),`
the total extension of the composite wire is:

A

`1.75 mm`

B

`2.0mm`

C

`1.5mm`

D

`1.25mm`

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