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An Aluminium and Copper wire of same cro...

An Aluminium and Copper wire of same cross sectional area but having lengths in the ratio 2: 3 are joined end to end. This composite wire is hung from a rigid support and a load is suspended from the free end. If the increase in length of the composite wire is 2.1 mm, the increase in lengths of Aluminium and Copper wires are:
`[Y_(Al)=20xx10^(11)N//m^(2) and Y_(CU) = 12xx10^(11)N//m^(2)]`

A

1.0 mm, 1.1 mm

B

0.6 mm, 1.5 mm

C

0.7 mm, 1.4 mm

D

0.9 mm, 1.2 mm

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