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Thermodynamics Part 2

Section: Physics

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Question : 9 of 100

Marks: +1, -0

A bimetallic strip consists of metals

A

B

. It is mounted rigidly as shown. The metal

A

has higher coefficient of expansion compared to that of metal

B

. When the bimetallic strip is placed in a cold bath, it will

[16 Mar 2021 Shift 2]

bend towards the right
not bend but shrink
Neither bend nor shrink
bend towards the left

Solution:

As per the question, coefficient of expansion of metal

A

is higher than that of

B

.

It means,

\alpha_{A}>\alpha_{B}

If the bimetallic strip is placed in a cold bath, then the length of both strips will decrease.

i.e.,

I_{A}>I_{B}

\therefore

The bimetallic strip will bend towards left.

It can be shown as below.

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