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Radius of circular arc of bent strip of thickness d, when strip temperature is changed to $∆ t$ is $(w h e r e α_{1}, α_{2} a r e c o e f f i c i e n t o f l i n e a e x p a n s i o n o f e a c h o f s t r i p)$

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R=dΔtα2−α1

R=Δtdα2−α1

R=dα2−α1Δt

R=Δtα2−α1d

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Correct option is C

average radius of curvature of bimetallic strip when temperature of strip is changed is R=d(α2-α1)∆t

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Radius of circular arc of bent strip of thickness d, when strip temperature is changed to ∆t is (where α1,α2 are coefficient of linea expansion of each of strip)

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Radius of circular arc of bent strip of thickness d, when strip temperature is changed to $∆ t$ is $(w h e r e α_{1}, α_{2} a r e c o e f f i c i e n t o f l i n e a e x p a n s i o n o f e a c h o f s t r i p)$