Article
1/23/2021
Magnets and electromagnets
- The area around a magnet is known as the magnetic field.
- Two like poles repel each other and two unlike poles attract each other.
- Every magnet has two poles: North and South.
- Magnetic fields travel from north to south so be careful to label a diagram in this way with an arrow on the line of field pointing towards south.
- A compass can be used to detect a magnetic field.
- When electricity passes along a wire, it forms a magnetic field.
- Using direct current will make the field in circles around the wire. This can be tested by using a compass.
- You need to learn the magnetic rules which includes the right hand grip rule.
- If a coil of wire is used a stronger magnetic field is produced.
- You also need to know about some devices that work by electromagnetism such as an electric bell and relay.
- If you are asked to draw the magnetic field around a magnet REMEMBER:
- The lines must travel around the magnet.
- They must not touch each other.
- Label the magnetic field with arrows going from north to south.