Table of contents | |
Magnetic Fields | |
Force of Attraction | |
Representing Magnetic Fields | |
The Earth's Magnetic Field |
The magnetic field around a bar magnet
Magnetic field lines for attracting and repelling bar magnets
Magnetic field lines between two bar magnets
Exam Tip
If you are asked to draw the magnetic field around a bar magnet remember to indicate both the direction of the magnetic field and the strength of the magnetic field.
You can do this by:
- Adding arrows pointing away from the north pole and towards the south pole
- Making sure the magnetic field lines are further apart as the distance from the magnet increases
Exam Tip
When drawing a uniform field, stick to the field directly between the two poles – don’t worry about what is going on around the sides.
- Start by drawing a single straight line (use a pencil and ruler) in the middle – make sure you indicate its direction
- Next draw two lines at the top and bottom of the gap
- Finally, you can add two further lines halfway between the others
Step 2:
Step 3:
Step 4:
Step 5:
Compasses around a bar magnet show the direction of the magnetic field from north to south
Exam Tip
Remember that the direction of the field line at a point is the same as the direction of the force a north pole would experience at that point
Comparison between the Earth’s Magnetic Field and a Bar Magnet
Geographic and Magnetic Poles of the Earth
Exam Tip
The Earth’s north pole actually acts like the south pole of a magnet: That’s why the north pole of a magnet is attracted to it.
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