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A copper wire and a steel wire of the sa...

A copper wire and a steel wire of the same length and same cross-section are joined end to end to form a composite wire. The composite wire is hung form a rigid support and a load is suspended form the other end. If the increses in length of the composite wire is `2.4mm`. then the increases in lenghts of steel and copper wires are

A

`0.1mm,2.0mm`

B

`1.2mm, 1.2mm`

C

`0.6mm, 1.8mm`

D

`0.8mm, 1.6mm`

Text Solution

Verified by Experts

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