Two straight metallic strips each of thickness t and length ????
are rivetted together. Their coefficients of linear expansions
are α₁ and α₂ . If they are heated through temperature DT,
the bimetallic strip will bend to form an arc of radius
(a) t /{α₁ + α₂ )ΔT} (b) t /{(α₂ - α₁)ΔT}
(c) t (α₁ - α₂ )ΔT (d) t (α₂ - α₁)ΔT
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sorry I don't know your thoughts
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