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magnetic field

noun

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.
magnetic intensity.

magnetic field

noun

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

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.
See Note at magnetism
See magnetic field strength

magnetic field

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 .)

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Word History and Origins

Origin of magnetic field¹

First recorded in 1835–45

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Example Sentences

Examples have not been reviewed.

These emission lines can split into several components in the presence of a magnetic field, caused by the interaction between the internal magnetic moments of the emitting atoms and molecules with the external magnetic field.

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If directed towards Earth, our magnetic field pulls the energy into Earth, entering our atmosphere at the poles.

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Induction occurs when the magnetic field of another active line nearby induces an electric current in the unconnected line.

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This varying Sun-Earth alignment throughout the year results in differences to the amount of solar energy that interacts with Earth's magnetic field and therefore changes the strength of aurora.

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While similar to MRI - which was also developed in Aberdeen - the FCI scanner is described as being able to vary the strength of the magnetic field during the patient's scan.

From

magnetic equator magnetic field of the Earth

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