A science publisher needs a photograph of iron filings that shows a region of uniform magnetic field. Bar magnets are used to make the field.
Where should the iron filings be photographed?
In the narrow gap between two north poles facing each other
Just beyond the north pole of a single bar magnet
In the narrow gap between a north pole and a south pole facing each other
Beside the middle of the long side of a single bar magnet
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.