Study Notes
Magnetism involves the study of magnets, magnetic fields, and electromagnets. Magnets have properties such as attracting certain metals and having north and south poles.
- Magnetism — the force exerted by magnets when they attract or repel each other. Example: Lodestone attracts small pieces of iron.
- Permanent Magnet — a magnet that retains its magnetic properties over time. Example: Bar magnets are permanent magnets.
- Temporary Magnet — a magnet that only exhibits magnetic properties when in a magnetic field. Example: Iron becomes magnetized when placed near a magnet.
- Magnetic Field — the area around a magnet where magnetic forces can be detected. Example: Field lines show the direction of magnetic forces.
- Electromagnet — a type of magnet where the magnetic field is produced by an electric current. Example: A coil with a current flowing through it acts as an electromagnet.
Exam Tips
Key Definitions to Remember
- Magnetism
- Permanent Magnet
- Temporary Magnet
- Magnetic Field
- Electromagnet
Common Confusions
- Confusing permanent magnets with electromagnets
- Misunderstanding the direction of magnetic field lines
Typical Exam Questions
- What word best describes bar magnets? Permanent
- What do opposite poles do? Attract
- Specifically in which direction do the lines run in a field diagram? North to south
What Examiners Usually Test
- Understanding of the properties of magnets
- Ability to describe and draw magnetic field lines
- Differences between permanent magnets and electromagnets