Magnetic field - definition

A Magnetic Field is a vector physical field describing the force effects on moving electric charges and on bodies having a magnetic moment. It is generated by electric currents, alternating electric fields or natural sources of magnetism, such as permanent magnets. The magnetic field does not exist as an independent substance, but as a manifestation of the electromagnetic variation of space in which the Lorentz force acts on charged particles in motion.

The magnetic field vector determines both the direction and the value of the magnetic force acting on a unit charge moving at a unit speed, according to the right-hand rule. Mathematically it is defined by the formula F = q(v × B), where F is the magnetic force, q is the electric charge, v is the particle's velocity vector and B is the magnetic induction vector. The SI unit of magnetic field is tesla (T).

The magnetic field is an intrinsic component of the electromagnetic field and is closely related to the electric field, as described by Maxwell's equations. The magnetic field does not have a direct effect on charges at rest, but on moving charges and currents, which is the basis for the operation of electric motors, generators, transformers and many sensors.

Graphically, the magnetic field is represented by field force lines that form closed loops and never intersect. These lines extend from the north pole of the field source and return to the south pole, creating a spatial representation of the distribution of magnetic interaction. In the case of a current-carrying conductor, the field lines form circles around the conductor, according to the helical rule.

In the presence of ferromagnetic materials, the field can be enhanced by the phenomenon of magnetisation, leading to a concentration of field lines inside these materials. Magnetic field phenomena play a key role in solid state physics, electromagnetic engineering, communication technology, power systems and magnetic memory devices.

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