A student measured the force needed to pull a steel ball away from a magnet. The student repeated the measurement with the ball at four different distances from the magnet. Table shows the results.
Table: The force needed to pull a steel ball away from a magnet at four different distances
| Distance from the magnet in mm | 5 | 10 | 15 | 20 |
|---|---|---|---|---|
| Force in N | 4.80 | 1.20 | 0.53 | 0.30 |
Use the table to describe how the force changes as the distance from the magnet increases.
Explain, in terms of the magnetic field, why the force decreases as the distance increases.
40 exam-style questions on AQA GCSE Physics 7.1 Permanent and induced magnetism, magnetic forces and fields, covering 7.1.1 Poles of a magnet and 7.1.2 Magnetic fields. Each one has a worked solution and a mark scheme showing where the marks go.