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An Aluminum and Copper wire of same cro...

An Aluminum 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 form a rigid support and a load is suspended form the free end. If the increases in length of the composite wire is `2.1mm` the increses in lenghts of Aluminimum and Copper wirs are

A

`0.7mm, 1.4mm`

B

`0.9mm, 1.2mm`

C

`1.0mm, 1.1mm`

D

`1.6mm, 1.5mm`

Text Solution

Verified by Experts

The correct Answer is:
D
`e = e_(1) + e_(2), (e_(1))/(e_(2)) = (l_(1))/(l_(2)) xx (Y_(2))/(Y_(1))`
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