A student is investigating electromagnetic induction using a bar magnet and a solenoid connected to a sensitive voltmeter. In which of the following scenarios will the voltmeter record a non-zero reading?
The bar magnet is held stationary inside the stationary solenoid.
The bar magnet and the solenoid are both moved to the right at the same constant speed of 2 m/s2\text{ m/s}2 m/s.
The solenoid is moved towards the stationary bar magnet at a constant speed of 2 m/s2\text{ m/s}2 m/s.
Both the bar magnet and the solenoid are kept stationary, but the number of turns in the solenoid is doubled.
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.