Explain, in terms of charge carriers, why metals (such as copper) are excellent electrical conductors, whereas insulators (such as glass) are very poor conductors.
A synthetic balloon is rubbed with a woollen cloth. When the balloon is brought near small, lightweight pieces of paper, the paper is attracted to it. Explain why this happens.
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.