A magnetic field is the magnetic effect of electric currents and magnetic materials. The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field.
Both the electric field and magnetic field can be defined from the Lorentz force law: The electric force is straigtforward, being in the direction of the electric field if the charge q is positive...
Pulses of strong magnetic fields are used in FMRI (functional magnetic resonance imaging) for monitoring brain activity and in MRI for imaging tissues throughout the body.
The magnetic field is the area around a magnet in which there is magnetic force. Moving electric charges can make magnetic fields. Magnetic fields can usually be seen by magnetic flux lines. At all times the direction of the magnetic field is shown by the direction of the magnetic flux lines.
4.1 Magnetic field of permanent magnets
A magnetic field is generated when electric charge carriers such as electrons move through space or within an electrical conductor.
Related to magnetic field: magnetic force, magnetic induction, magnetism, electromagnetic field, Earth's
A magnetic field is generated due to: Magnetic moment. Moving charge. Magnets have two poles, a north and a south. Like poles repel, unlike poles attract. Magnets will try to align their poles. North and south pole: pole of earth is reversed; geographic north is magnetic south and vice versa.
The field lines defining the structure of the magnetic field are similar to those of a simple bar magnet, as illustrated in the following figure.
The area around a magnet within which magnetic force is exerted, is called a magnetic field. It is produced by moving electric charges.