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An iron rod of length 50cm is joined end...

An iron rod of length 50cm is joined end to end to an aluminium rod of length 100cm. All measurements refer to `20^(@)C`. The coefficients of linear expansion of iron and aluminium are `12xx10^(-6)//""^(@)Cand24xx10^(-6)//""^(@)C` respectively. The average coefficient of composite rod is

A

`20 xx 10^(-6)//""^(@) C`

B

`36 xx 10^(-6)//""^(@) C`

C

`12 xx 10^(-6)//""^(@) C`

D

`48 xx 10^(-6)//""^(@) C`

Text Solution

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The correct Answer is:
A
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