A student rubs a plastic ruler with a woollen cloth. The ruler becomes negatively charged.
What has happened to the ruler?
It has gained electrons.
It has gained protons.
It has lost electrons.
It has lost protons.
145 exam-style questions on CIE IGCSE Physics 4.2.1a Positive and negative charge. Each one has a worked solution and a mark scheme showing where the marks go.