Final answer:
When two identical rectangular strips of copper and steel are riveted to form a bimetallic strip, it will bend on heating due to the different coefficients of thermal expansion of the metals.
Step-by-step explanation:
When two identical rectangular strips of copper and steel are riveted to form a bimetallic strip, the strip will bend on heating. This is because different metals have different coefficients of thermal expansion, which means they expand or contract at different rates when heated or cooled. In the case of the bimetallic strip, one metal will expand or contract more than the other, resulting in a change in shape. For example, if copper expands more than steel, the bimetallic strip will bend towards the side with the steel.