A student starts with an uncharged perspex strip and an uncharged dry paper towel. The student rubs them together and measures their charges.
| Material | Charge after rubbing |
|---|---|
| Perspex strip | +4.0 nC+4.0\ \mathrm{nC}+4.0 nC |
| Dry paper towel | −4.0 nC-4.0\ \mathrm{nC}−4.0 nC |
Explain what happened to electrons during rubbing and what the readings show about the charges on the two materials.
91 exam-style questions on Edexcel GCSE Physics 11.1 Charging by friction, covering 11.1.1 Charging insulators by friction, 11.1.2 Forces between charges, 11.1.3 Electrostatic phenomena, and 11.1.4 Earthing and removing charge. Each one has a worked solution and a mark scheme showing where the marks go.