An educational hand-cranked generator consists of a coil of wire that rotates inside a magnetic field produced by stationary permanent magnets.
Which of the following changes would result in a lower maximum output electromotive force (e.m.f.)?
Rotating the crank handle at a faster rate.
Using a coil with a larger cross-sectional area.
Replacing the permanent magnets with weaker magnets.
Increasing the number of turns of wire in the coil.
24 exam-style questions on CIE IGCSE Physics 4.5.2 The a.c. generator. Each one has a worked solution and a mark scheme showing where the marks go.