An engineer wants to verify that the magnetic field detected in an empty wooden workshop is solely due to the Earth's magnetic field, rather than any hidden structural steel or active electrical wiring.
Describe how they could use a standard plotting compass to confirm that the Earth's magnetic field is present and dominant in this space.
30 exam-style questions on Edexcel GCSE Physics 12.1 Magnets and magnetic fields. Each one has a worked solution and a mark scheme showing where the marks go.