Creating a uniform magnetic field
2 marks · EasyDescribe how to arrange two permanent bar magnets to create a nearly uniform magnetic field.
State one way you could check if the field is uniform.
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(a) Place the bar magnets so the north pole of one faces the south pole of the other, close together with a small gap. · must show N facing S, small gap
(b) Use iron filings or a compass and check that the field lines are straight, parallel and evenly spaced. · must show field lines straight/parallel/evenly spaced
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Describes correct arrangement (N facing S, magnets close or small gap)
B2 (b) · 1 mark · Mentions using iron filings or compass to check for straight/parallel/evenly spaced lines
Worked solution
a) Arrange two bar magnets with the north pole of one facing the south pole of the other, close together.
b) Place iron filings (or use a compass) in the gap and see if the lines are straight and evenly spaced.