A glass rod and a piece of silk cloth are initially uncharged. The glass rod is then rubbed with the silk cloth, causing both to become charged. The glass rod becomes positively charged because some charged particles move from the glass rod to the silk cloth.
What is the charge on the silk cloth and which particles moved during this charging process?
Charge on silk: positive; Particles that moved: protons
Charge on silk: negative; Particles that moved: electrons
Charge on silk: positive; Particles that moved: electrons
Charge on silk: negative; Particles that moved: protons
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.