In an industrial manufacturing plant, a flat PVC (polyvinyl chloride) sheet is polished by a dry woollen buffing wheel. After this process, the PVC sheet is found to have acquired a significant negative electrostatic charge.
Explain, in terms of subatomic particles, how the PVC sheet becomes negatively charged.
47 exam-style questions on Edexcel GCSE Physics 11.1 Charging by friction. Each one has a worked solution and a mark scheme showing where the marks go.