- Demonstrate the toy which allows you to add hair to a face by moving iron filings using a magnet. Invite suggestions as to how it works.
- Use a magnet on the overhead projector (OHP), covered with a piece of perspex, to demonstrate the magnetic field lines around a single magnet, and also between magnets with like and unlike poles facing. Explain or show,
eg using a 'Magnaprobe', that the field exists in three dimensions.
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- recall the shape of the magnetic field line pattern around a bar magnet,
eg strongest forces at the poles
- describe how the model of field lines shows that the field strength (magnetic force) falls as the distance from the magnet increases
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