A student rubs a plastic ruler with a woollen cloth. The plastic ruler then repels a negatively charged balloon.
Which row is correct?
| State of the plastic ruler | What happened when the ruler was rubbed | |
|---|---|---|
| A | Negatively charged | It gained some electrons |
| B | Negatively charged | It lost some protons |
| C | Positively charged | It lost some electrons |
| D | Positively charged | It gained some protons |
Row A
Row B
Row C
Row D
452 exam-style questions on CIE IGCSE Physics 4.2 Electrical quantities, covering 4.2.1a Positive and negative charge, 4.2.1b Charging by friction and detecting charge, 4.2.1c Electrical conductors and insulators, 4.2.1d Electric fields and electric field patterns, 4.2.2a Electric current, charge and measuring current, 4.2.2b Conduction in metals and the direction of current, 4.2.2c Direct current and alternating current, 4.2.3a Electromotive force, 4.2.3b Potential difference and voltmeters, 4.2.4a Resistance, 4.2.4b Resistance of a metallic wire, 4.2.4c Current–voltage graphs, and 4.2.5 Electrical energy and electrical power. Each one has a worked solution and a mark scheme showing where the marks go.