A student rubs an uncharged glass rod with a dry silk cloth, causing both the rod and the cloth to become charged. Why does the glass rod become positively charged and the silk cloth become negatively charged?
The glass rod gains positive charges and the silk cloth loses electrons.
The glass rod gains electrons and the silk cloth loses electrons.
The glass rod loses electrons and the silk cloth gains electrons.
The glass rod loses electrons and the silk cloth loses positive charges.
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.