A student sprinkles iron filings around a bar magnet.
The student measures the spacing between neighbouring lines of filings at four points, P, Q, R and S.
Table
| Point | Distance from the nearest part of the magnet (cm) | Spacing between lines of filings (mm) |
|---|---|---|
| P | 1.0 | 2 |
| Q | 3.0 | 5 |
| R | 6.0 | 9 |
| S | 0.5 | 12 |
Which conclusion is correct?
The field is strongest at S, because S is closest to the magnet
The field is strongest at R, because its lines are furthest apart
The field is weakest at P, because its lines are closest together
The field is strongest at P, because its lines are closest together
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.