Creating a uniform magnetic field
2 marks · EasyGive one reason why it is useful to create a uniform magnetic field in an experiment.
Describe one characteristic of the field lines between two bar magnets arranged to create a uniform field.
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(a) To ensure the force on particles or objects is the same everywhere in the experiment. · must show force is constant, field does not vary
(b) The field lines are straight, parallel, and evenly spaced. · must show straight, parallel, even spacing
Common mistakes: Mixing up uniform with non-uniform features
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Marking points
B1 (a) · 1 mark · Gives an appropriate use of a uniform field such as ensuring a constant force or consistent conditions
B2 (b) · 1 mark · States at least one correct characteristic: straight/parallel/evenly spaced
Worked solution
a) It provides consistent force/conditions for fair testing in experiments.
b) The field lines are straight and parallel, evenly spaced across the region.