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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) 

a
R=dΔtα2−α1
b
R=Δtdα2−α1
c
R=dα2−α1Δt
d
R=Δtα2−α1d

detailed solution

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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