A strip of iron and a strip of brass are joined tightly together along their full length. This paired arrangement is called a bimetallic strip. When the bimetallic strip is heated, it bends as shown. It is then cooled and returns to a straight shape. What causes the bimetallic strip to become straight again?
- AThe brass contracts more than the iron.
- BThe brass expands more than the iron.
- CThe iron contracts more than the brass.
- DThe iron expands more than the brass.