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Question

A bimetallic strip consists of metals X and Y. It is mounted rigidly at the base as shown in the figure. The metal X has a higher coefficient of expansion than metal Y. When the bimetallic strip is placed in a cold bath,


A
It will bend towards right.
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B
It will bend towards left.
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C
It will not bend but shrink.
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D
It will neither bend nor shrink
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Solution

The correct option is B It will bend towards left.
Given:
Coefficient of expansion of X
(αX) is greater than coefficient of expansion of Y (αY)

This means with per degree fall in temperature, X strip will contract more than Y strip.
And we know that for arc having some width, outer circumference is greater than inner circumference, therefore X will be inward and Y outward in the arc formed. So, bimetallic strip will bend towards left.
Before cooling -


After cooling -


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