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AQA · GCSE · Combined Science · Higher

Magnetic-field strength from field-line spacing

Q04.2 1 mark

Figure 4 shows the magnetic field pattern around a permanent magnet.

Diagram of magnetic field lines around a bar magnet. The magnet is labelled N on the left and S on the right. Field lines curve from the north pole to the south pole outside the magnet and are closest together near the poles.

Figure 4

Enlarged question image

Diagram of magnetic field lines around a bar magnet. The magnet is labelled N on the left and S on the right. Field lines curve from the north pole to the south pole outside the magnet and are closest together near the poles.
Figure 4

How does Figure 4 show that the strength of the magnetic field is not the same at all places?

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Marking points

  1. 1 State that the field lines are not equally spaced, or that the distance between the field lines varies.

Full-mark answer

The field lines are closer together in some places than others, so the distance between the field lines varies.

Why this answer loses marks

The arrows point in different directions.

The arrows show field direction, not field strength. Field strength is shown by how close the lines are.

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