First slide

Thermal expansion

Question

When a bimetallic strip is heated, it

Easy

A

Does not bend at all
B

Gets twisted in the form of an helix
C

Bend in the form of an arc with the more expandable metal outside
D

Bends in the form of an arc with the more expandable metal inside

Solution

A bimetallic strip on being heated bends in the form of an arc with more expandable metal (l) outside (as shown)

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