CREATING A UNIFORM MAGNETIC FIELD
2 marks · NormalDescribe what would happen to the uniformity of the magnetic field if one of the bar magnets was moved further away from the other.
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The field would become less uniform; lines would no longer be straight and evenly spaced, and the strength would change across the region.
Must show: Less uniform field, Change in spacing/strength, Field lines no longer parallel
Also accept: Field lines would curve; field strength weaker and direction not the same everywhere
Common mistakes: Not relating to field line shape or spacing
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Marking points
B1 · 1 mark · States the field would be less uniform
B2 · 1 mark · Describes that the field lines would not be straight/evenly spaced, or strength/direction would change
Worked solution
The magnetic field would become less uniform. The field lines in the region would not be as straight or as evenly spaced, and the strength and direction of the field would vary across the gap.