A bimetallic strip is used to regulate the temperature of electrical appliances. It consists of two different metals joined firmly together. The diagram illustrates the shape of the bimetallic strip before heating and after heating. Which statement is correct?
- AMetal P contracts more than metal Q on heating.
- BMetal Q contracts more than metal P on heating.
- CMetal P expands more than metal Q on heating.
- DMetal Q expands more than metal P on heating.