A flat coil of wire is positioned inside a uniform magnetic field. Which action would result in an induced electromotive force (e.m.f.) in the coil?
Translating the coil parallel to the magnetic field lines without rotating it.
Rotating the coil about an axis perpendicular to the magnetic field lines.
Placing a block of wood near the stable coil.
Keeping the coil stationary and cooling it to a lower temperature.
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.