A student maps a bar magnet on paper. Halfway through, the magnet is accidentally moved sideways but its outline is not changed. The student continues plotting. Why is the completed map unreliable?
The magnetic field is removed from the paper when the magnet moves.
The compass loses its permanent magnetism when the magnet moves.
The marks combine directions from two different magnet positions.
The marks show strength instead of direction after the magnet moves.
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.