First slide

Thermal expansion

Question

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

Easy

A

$R = \frac{d Δ t}{(α_{2} - α_{1})}$
B

$R = \frac{Δ t}{d (α_{2} - α_{1})}$
C

$R = \frac{d}{(α_{2} - α_{1}) Δ t}$
D

$R = \frac{Δ t (α_{2} - α_{1})}{d}$

Solution

average radius of curvature of bimetallic strip when temperature of strip is changed is $R = \frac{d}{(α_{2} - α_{1}) ∆ t}$

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