magnetic field

noun

1. a region of space near a magnet, electric current, or moving charged particle in which a magnetic force acts on any other magnet, electric current, or moving charged particle.
2. magnetic intensity.

magnetic field

noun

1. a field of force surrounding a permanent magnet or a moving charged particle, in which another permanent magnet or moving charge experiences a force Compare electric field

magnetic field

1. A field of force associated with changing electric fields , as when electric charges are in motion. Magnetic fields exert deflective forces on moving electric charges. Most magnets have magnetic fields as a result of the spinning motion of the electrons orbiting the atoms of which they are composed; electromagnets create such fields from electric current moving through coils. Large objects, such as the earth, other planets, and stars, also produce magnetic fields.
2. See Note at magnetism
3. See magnetic field strength

magnetic field

1. A magnetic field is said to exist in a region if a force can be exerted on a magnet . If a compass needle is deflected when it is put at a particular location, we say a magnetic field exists at that point, and the strength of the field is measured by the strength of the force of the compass needle. The Earth , the sun , and the Milky Way galaxy all have magnetic fields. All known magnetic fields are caused by the movement of electrical charges . Electrons in orbit in atoms give rise to magnetic fields, so that every atom is, like the Earth, surrounded by a magnetic field. ( See magnet and magnetism .)

Word History and Origins

Origin of magnetic field¹

First recorded in 1835–45

Example Sentences

A planet’s magnetic field traps any gases and other material coming off the planet and its moons.

From BBC

The first colonists would encounter a barren landscape without water or breathable atmosphere, bathed in deadly solar and galactic radiation from which Earthbound humans are protected by our planet’s atmosphere and magnetic field.

From Los Angeles Times

Combined with flares, they can create solar storms that interact with Earth's magnetic field or magnetosphere.

From BBC

It is true that the outer core generates electrical currents that sustain the planet’s magnetic field, but Vidale says shifts in the Texas-size inner core are too minuscule to have an impact.

From Los Angeles Times

Additionally, analysis of Allan deviation showed that the magnetometer can measure magnetic fields as low as 0.3 pT and maintain remarkable sensitivity for a long time.

From Science Daily