Physics › Section P · Magnetism › Topic P.1
Magnets, electromagnets, and field lines
A compass needle swings round without anything touching it, and a crane lifts a scrapped car with nothing but a coil of wire and a current. This topic shows where magnetism comes from, how materials respond to it, and how field lines picture it.
In this topic
- A force without contact
- North and south poles
- Earth is a magnet
- Ferromagnets and domains
- Worked example: is it a magnet?
- Electromagnets
- Currents and spin: the sources of magnetism
- Magnetic field lines
- How strong are magnetic fields?
- Worked example: an MRI field and Earth's field
- Common mistakes to avoid
- Key takeaways
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