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Linear Expansion

If a bimetall...

Question

If a bimetallic strip is heated it will

A

Bend towards the metal with lower thermal expansion coefficient

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B

Bend towards the metal with higher thermal expansion coefficient

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C

Twist itself into a helix

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D

Have no bending

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Solution

The correct option is C Bend towards the metal with lower thermal expansion coefficient
The different expansions force the flat strip to bend one way if heated, and in the opposite direction if cooled below its initial temperature. The metal with the higher coefficient of thermal expansion expands more and hence it is on the outer side of the curve when the strip is heated.

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