Magnetic fields
2 marks · NormalExplain why magnetic field lines are drawn closer together near the poles of a bar magnet.
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Because the magnetic field is strongest near the poles, so field lines are drawn closer to represent stronger fields.
Also accept: The magnetic field strength is greatest at the poles, and closely spaced field lines show greater field strength.
Common mistakes: Reversing the field direction; Thinking actual lines exist
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Marking points
B1 · 1 mark · States that the field is strongest at the poles
B2 · 1 mark · Explains that closer lines indicate stronger fields
Worked solution
The field is strongest at the poles of the bar magnet, so we draw the field lines close together to show where the field is strongest.