The battery of a shake-to-charge emergency flashlight is recharged by a simple induction generator. In this generator, a permanent magnet slides back and forth through the center of a stationary coil of wire. Which statement is correct?
The induced electromotive force (e.m.f.) increases if the number of turns in the coil is decreased.
The induced e.m.f. increases if the magnet is shaken more rapidly back and forth.
The induced e.m.f. decreases if a stronger magnet of the same dimensions is used.
The induced e.m.f. is completely independent of the magnetic field strength of the magnet.
35 exam-style questions on CIE IGCSE Physics 4.5.1a Electromagnetic induction. Each one has a worked solution and a mark scheme showing where the marks go.