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Two wires of same length and thickness a...

Two wires of same length and thickness are joined end to end. Their Young's moduli are `15 xx 10^10 pa` and `20 xx 10^10pa` . If the combination is stretched by a certain load, the elongations of these wires will be in the ratio

A

`3:4`

B

`4:3`

C

`1:1`

D

`1:2`

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