What are magnetic fields?
The space around a magnet in which a magnetic force acts is called a magnetic field. When a magnet is placed in such a field, magnetic forces are exerted on it. However, the field will exist even if the Magnet is removed. Furthermore, when current flows in a wire, a magnetic field is generated around the wire. From this it can be deduced that magnetic fields are generated by the movement of electric charges. Usually, a magnetic field is determined by the Lorentz force, which also supports the theory of a movement of electric charges. Even the earth itself produces its own magnetic field, which helps us to steer an airplane and is also relevant for other navigation instruments. Electric motors and generators that produce electricity also use magnetic fields.