MAGNETIC FIELDS
3 marks · NormalFigure 1 shows the magnetic field lines drawn around a bar magnet.
Label with arrows the direction of two field lines on the diagram.
Explain why the magnetic field is strongest at the poles of the bar magnet.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) Field line arrows must point away from the north pole and towards the south pole, on at least two field lines. · must show arrows N to S
(b) The field is strongest at the poles because the field lines are closest together at these regions, showing a high concentration of magnetic force. · must show field lines close together at poles, shows strength
Must show: arrows on two lines N to S
Common mistakes: Drawing arrows from south to north; Failing to mention field line concentration at poles
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Correct arrow direction from N to S on two field lines.
B2 (b) · 1 mark · States that field lines are closest together at poles.
B3 (b) · 1 mark · Links closeness of field lines to field strength.
Worked solution
a) Draw arrows along the field lines starting at the north pole and going towards the south pole.
b) The poles have the highest concentration of field lines, so the field is strongest there.