A glass rod is rubbed with a dry silk cloth. This process causes both the rod and the cloth to become electrostatically charged due to the transfer of electrons.
Which of the following correctly compares the types of charges acquired by the glass rod and the silk cloth, and describes the electrostatic force between them?
Opposite charges; they repel
Opposite charges; they attract
Identical charges; they repel
Identical charges; they attract
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.