A dipping compass is used at different places on the Earth.
Table
| Place | Angle of needle below the horizontal (∘^\circ∘) |
|---|---|
| Near the magnetic equator | 0 |
| Half way to a magnetic pole | 50 |
| Close to a magnetic pole | 88 |
Which conclusion is best supported by the data?
The field is strongest at the equator, so it comes from rocks there
The field lines are parallel to the ground everywhere on the Earth
The needle is pulled down by gravity, which is larger at the poles
The field pattern matches a bar magnet field from inside the Earth
44 exam-style questions on OCR GCSE Physics 4.1 Magnets and magnetic fields, covering 4.1.1 Magnetic poles, attraction and repulsion, 4.1.2 Permanent and induced magnets, 4.1.3 The magnetic field of a magnet, 4.1.4 Compasses and the Earth's magnetic field, 4.1.5 The magnetic field around a current-carrying wire, 4.1.6 Field strength, current and distance, and 4.1.7 Solenoids and electromagnets. Each one has a worked solution and a mark scheme showing where the marks go.