Magnets

Magnets are objects that produce a magnetic field. They have two poles, called the north pole and the south pole. Like poles repel each other, while opposite poles attract each other.

Types of Magnets

There are three main types of magnets:

1. Permanent Magnets: These magnets retain their magnetism without the need for an external magnetic field. Examples include fridge magnets and bar magnets.
2. Temporary Magnets: These magnets only retain their magnetism when exposed to a magnetic field. When the magnetic field is removed, they lose their magnetism. Examples include electromagnets.
3. Electromagnets: These magnets are created by passing an electric current through a wire coil. They can be turned on and off by controlling the electric current.

Uses of Magnets

Magnets have various applications in everyday life, including:

• Electrical appliances
• Medical devices
• Computers and electronics
• Transportation (such as magnetic levitation trains)
• Construction and manufacturing

Magnetic Fields

Magnetic fields are the regions around a magnet where its magnetic force is exerted. The magnetic field lines flow from the north pole to the south pole. The strength of the magnetic field is greater closer to the poles.

Study Guide

Here are some key points to remember about magnets:

1. What are the two poles of a magnet called?
2. What happens when like poles of two magnets are brought close to each other?
3. Give an example of a permanent magnet.
4. How is an electromagnet different from a permanent magnet?
5. List three everyday applications of magnets.
6. Describe the magnetic field around a magnet.

Remember to review these key points and practice with examples to reinforce your understanding of magnets!