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Two identical thin metal strips one of a...

Two identical thin metal strips one of aluminium and the other of iron are riveted together to form a bimetallic strip. The temperature is raised by `50^(@)C`. If the central planes of the two strips are separated by 2nm and the coefficients of thermal expansion of aluminium and iron are respectively `30 xx 10^(-6)//^(@)C` and `10 xx 10^(-6)//^(@)C` the average radius of curvature of the bimetallic strip is about

A

`1.78m`

B

`2.67m`

C

`3.12m`

D

`4.56m`

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The correct Answer is:
A
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