Magnetic field

Force field caused among others by moving electric charges. Magnetic fields occur in the vicinity of conductors flown through by current and in the vicinity of permanent magnets. In case of permanent magnets currents caused by the moving electrons inside the atom are the source of the magnetic field. The magnetic field strength H marks strength and direction of the magnetic field, its measure is ampere per metre (A/m). Besides the magnetic field strength also the magnetic flux density B describes the strength of the magnetic field, the measure is tesla (T). 1 T = 1 Vs/m², the measure microtesla (µT) is common. The following applies to the conversion of magnetic flux density into magnetic field strength in the air or in biological tissue: 1 µT corresponds to 0.8 A/m.