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

The Northern Lights are caused by solar winds carrying charged particles interacting with the earth's magnetic field.

From BBC

Edison said earlier this year that the unused transmission line in Eaton Canyon may have become energized through induction, a process where magnetic fields created by nearby live lines cause the dormant line to electrify.

From Los Angeles Times

MRI machines use a strong magnetic field to produce detailed images.

From BBC

Scientists know that the Sun has a quiet period when the magnetic fields are ordered, with our star having a fixed magnetic north and south pole.

From BBC

But space weather can be hazardous too, affecting Earth's magnetic field and potentially disrupting communication systems and infrastructure.

From BBC