A student is provided with a multi-turn coil of wire (solenoid), a sensitive center-zero galvanometer, and a bar magnet.
Describe how the student could use this equipment to demonstrate the induction of an e.m.f. in the wire.
State how the student will know when an e.m.f. has been induced.
Describe two ways the student could increase the magnitude of the induced e.m.f.
275 exam-style questions on CIE IGCSE Physics 4.5 Electromagnetic effects, covering 4.5.1a Electromagnetic induction, 4.5.1b Direction of an induced e.m.f., 4.5.2 The a.c. generator, 4.5.3a Magnetic effect of a current and its applications, 4.5.3b Strength and direction of the field around wires and solenoids, 4.5.4a Force on a current-carrying conductor, 4.5.4b Force on beams of charged particles, 4.5.5 The d.c. motor, 4.5.6a Construction and operation of a transformer, 4.5.6b Turns ratio and current in a transformer, and 4.5.6c High-voltage transmission of electricity. Each one has a worked solution and a mark scheme showing where the marks go.