Two students map the same bar magnet in the same position. One draws twice as many field lines as the other. Both maps show the same overall shape and relative spacing pattern. Which conclusion is justified?
The extra lines show a stronger magnet; each map must show uniform strength.
The extra lines do not show a stronger magnet; each map must show uniform strength.
The extra lines do not show a stronger magnet; each map can show the poles as strongest.
The extra lines show a stronger magnet; each map can show the poles as strongest.
70 exam-style questions on Edexcel GCSE Physics 12.1 Magnets and magnetic fields, covering 12.1.1 Magnetic poles, 12.1.2 Magnetic materials; permanent and induced magnets, 12.1.3 Magnetic fields, and 12.1.4 Plotting compasses and the Earth's magnetic field. Each one has a worked solution and a mark scheme showing where the marks go.