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Q.

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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a

R=Δtdα2−α1

b

R=dΔtα2−α1

c

R=dα2−α1Δt

d

R=Δtα2−α1d

answer is C.

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Detailed Solution

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

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