An acetate rod and a dry cloth are initially uncharged.
The rod is now rubbed with the cloth and they both become charged. The rod becomes positively charged because some charged particles move from the rod to the cloth.
What is the charge on the cloth and which particles moved in the charging process?
Charge on cloth: positive; Particles that moved: protons
Charge on cloth: positive; Particles that moved: electrons
Charge on cloth: negative; Particles that moved: protons
Charge on cloth: negative; Particles that moved: electrons
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.