Question

how does a brass iron bimetallic strip bend on heating

Answer 1

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When this bimetallic strip is heated, the brass expands more than the steel and the strip curves with the brass on the outside. If the strip is cooled, it curves with the steel on the outside. Bimetallic strips are used as switches in thermostats.
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Answer 2

Answer:

When a bimetallic strip of brass-iron is heated,the brass expands more than the iron.

Explanation:

This unequal expansion bends the strip in such a way that the brass is on the outer side of the strip and the iron is on the inner side of the bend.