Magnetic field

The magnetic field can be compared to the attraction of the earth. However, it has an orientation and a certain value, a magnetic field strength.

In physics and the study of electricity, a magnetic field is a field that permeates space and which exerts a magnetic force on moving electrical charges and magnetic dipoles. Magnetic fields surround electric currents, magnetic dipoles and changing electric fields.

The magnitude and orientation are expressed as a vector, the magnetic field strength H. A related quantity is the magnetic flux density B, also called magnetic induction.

With magnetic viewing film you can see the field lines in a magnet.