First slide

Thermal expansion

Question

A bimetallic strip consists of metals X and Y. it is mounted rigidly at the base as shown. The metal X has a higher coefficient of expansion to that for metal Y. when the bimetallic strip is place in a cold bath

Moderate

A

It will bend towards the right
B

it will bend towards the left
C

it will bend but shrink
D

it will neither bend nor shrink

Solution

Decrease in length of X is more than decrease in Y hence it will bend towards left

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