A student investigates electromagnetic induction by dropping a bar magnet vertically through a stationary coil of wire connected to a data logger. Which of the following procedures will result in the greatest peak value of induced voltage across the coil?
Holding the magnet completely stationary inside the coil.
Releasing the magnet from rest 5 cm5\text{ cm}5 cm above the top of the coil so it falls through.
Releasing the magnet from rest 50 cm50\text{ cm}50 cm above the top of the coil so it falls through.
Lowering the magnet vertically through the coil at a slow, constant speed of 0.1 m/s0.1\text{ m/s}0.1 m/s.
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.