Study Notes
Magnetism involves the study of magnets, magnetic fields, and electromagnets. Magnets have unique properties and can be permanent or temporary, while electromagnets can be turned on and off.
- Magnetism — the force exerted by magnets when they attract or repel each other. Example: Lodestone attracting iron pieces.
- Permanent Magnet — a magnet that retains its magnetic properties even when not in a magnetic field. Example: Bar magnets.
- Temporary Magnet — a magnet that only exhibits magnetic properties when in a magnetic field. Example: Iron becoming magnetic near a magnet.
- Magnetic Field — the area around a magnet where magnetic forces can be detected. Example: Field lines around a bar magnet.
- Electromagnet — a type of magnet whose magnetic field is produced by the flow of electric current. Example: A coil of wire with a current passing through it.
Exam Tips
Key Definitions to Remember
- Permanent Magnet: A magnet that maintains its magnetism without an external field.
- Temporary Magnet: A magnet that only shows magnetism when in a magnetic field.
- Electromagnet: A magnet created by electricity flowing through a coil.
- Magnetic Field: The region around a magnet where magnetic forces act.
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 and magnetic fields.
- Differences between permanent magnets and electromagnets.
- Ability to interpret magnetic field diagrams.