First slide

Thermal expansion

Question

When a strip made of iron ( $α_{1}$ ) and copper $α_{2} (> α_{1})$ is heated:

Easy

A

its length does not change
B

it gets twisted
C

it bends with iron on concave side
D

it bends with iron on convex side

Solution

A bimetallic strip consists of two metals of different expansion coefficients.
if $α_{2} > α_{1}$ , the strip bends with iron on concave side

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