Associated with or produced by a magnet or the property of magnetism.

Forces created by the presence of an electric current, and electric charge, or a magnet.

The existence of an electric field is made known by its effect on another electric charge, and the existence of a magnetic field can be made known by its effect on another magnet.

A field around a magnet or an electric current will deflect a small magnet; such as, a compass needle, in a particular direction when it is placed in such a field.

The direction in which the north pole of the magnet points is normally called the direction of the field and the direction of the field generally follows curved lines of force.

1. All forms of energy emanating from an electrical source and transmitted through the air.

Included are the fields produced by light, radio, X-rays, and gamma rays and the higher the frequency of the fields produced, the more energy is contained.

2. The combination of electric and magnetic fields that surround moving electrical charges (for example, electrons); such as, those in electric currents.

Electromagnetic fields apply a force on other charges and can induce current flows in nearby conductors.

3. An oscillating electric field and its associated magnetic field acting at right angles to each other and at right angles to their direction of motion.
4. The region surrounding a moving electric charge which consists of magnetic and electric force fields especially related; such as, to orientation and strength, and that possesses a definite amount of energy.
5. A field created by the interplay of an electric field and a magnetic field when an electric current passes through a wire.

An electromagnetic field consists of two kinds of energy: electrostatic (potential energy) and electrodynamic (kinetic energy).

1. A measure of the magnetic strength of a magnet or a current-carrying coil, expressed as the torque produced when the magnet or coil is set with its axis perpendicular to unit magnetic flux density which is measured in ampere meters squared.
2. The magnetic moment of a current-carrying coil, equal to the product of the current, the number of turns, and the area of the coil.
3. The vector magnetic moment of a current-carrying coil, equal to the product of the current, the number of turns, and the area of the coil.

The direction is given by the right-hand rule (right hand rule) or hand rule, which refers to a current-carrying wire where the rule is that if the fingers of the right hand are placed around the wire so that the thumb points in the direction of current flow, the fingers will be pointing in the direction of the magnetic field produced by the wire.

1. The total amount of polarization (dipole moment) caused by the movement of electrons within an atom.
2. The magnetic dipole moment which an electron possesses by virtue of its spin.
3. The total magnetic dipole moment associated with the orbital motion of all the electrons of an atom and the electron spins.

This is opposed to a nuclear magnetic moment.

Electricity induced by a magnetic device.

A vector field (a quantity that has both direction and magnitude, e.g. force or velocity, usually represented by an arrow) occupying physical space in which a magnetic force can be detected, typically in the presence of a permanent magnet, current-carrying conductor, or electromagnetic wave.

A fluid composed of solid magnetic particles of subdomain size colloidally dispersed in a liquid carrier; used in inertial dampers, fluid-cooled loudspeakers, and ink-jet printing.

1. Either of two points on the earth's surface at which the manettic dip is exactly 90 degrees>
2. The point where the meridians join; for example, where the magnetic field is vertical.

1. A type of diagnostic radiography using electromagnetic energy.

Certain atomic nuclei with an odd number of neutrons, protons, or both are subjected to a radio-frequency pulse, causing them to absorb and release energy.

2. A non-invasive method of imaging the body and its organs; as well as, studying tissue metabolism.

More details about MRI

The body is placed in a magnetic field which causes certain atomic nuclei to align in the direction of the field. Pulses of radio-frequency radiation are then applied; interpretation of the frequencies absorbed and re-emitted allows an image in any body plane to be built up.

Different tissues; for example, fat and water, can be separately identified and, if the resonance signal for the fat is suppressed, then only the signal from any abnormalities in the fat can be identified.

Many diseases result in a rise in the water content of tissues; so, MRI, or magnetic resonance imaging, is a valuable test for identifying certain diseases.

Four equations, formulated by James Clerk Maxwell, that together form a complete description of the production and interrelation of electric and magnetic fields.

The statements of these four equations are as follows:

1. Electric field diverges from electric charge.
2. There are no isolated magnetic poles.
3. Electric fields are produced by changing magnetic fields.
4. Circulating magnetic fields are produced by changing electric fields and by electric currents.

Maxwell based his description of electromagnetic fields on these four statements.

A technology in which the superconducting characteristics of low-temperature materials produce intense magnetic fields to store energy; proposed as a storage option in photovoltaics to smooth out fluctuations in power generation.