Magnetically levitated trains (known as maglev trains) use magnets under their carriages to float above the magnetic tracks - Leaving Cert Physics - Question c - 2019

A magnetic field is the region or space around a magnet where magnetic forces can be experienced. It is often visualized through field lines that represent the strength and direction of the magnetic force.

To plot the magnetic field of a bar magnet, follow these steps:

1. Apparatus: You will need a bar magnet, compass, paper, and a pencil.
2. Procedure: Place the bar magnet on a flat surface and place the piece of paper over it.
3. Use the compass to locate the direction of the magnetic field. Place the compass near one pole of the magnet and observe the direction the needle points. Mark this point.
4. Move the compass around the magnet, marking points where the needle indicates the direction of the field.
5. Once you have enough points around the magnet, join them to create lines with arrows indicating the direction of the magnetic field. This will give a visual representation of the magnetic field lines.

One other use of magnets is in electric motors, where they are employed to convert electrical energy into mechanical energy.