Two straight metallic strips each of thi...

Two straight metallic strips each of thickness t and length l are rivetted together. Their coefficients of linear expansions are` alpha_(1) "and" alpha_(2) `. If they are heated through temperature `DeltaT`, the bimetallic strip will bend to form an arc of radius

`t//{(alpha_(1)+alpha_(2))DeltaT}`

`t//{(alpha_(2)-alpha_(1))DeltaT}`

`t(alpha_(1)-alpha_(2))DeltaT`

`t(alpha_(2)+alpha_(1))DeltaT`

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