magnetic needle


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Related to magnetic needle: magnetic compass

magnetic needle

a slender magnetized rod used in certain instruments, such as the magnetic compass, for indicating the direction of a magnetic field

magnetic needle

[mag′ned·ik ′nēd·əl]
(electromagnetism)
A bar magnet or collection of bar magnets which is hung so as to show the direction of the magnetic field.
In particular, a slender bar magnet, pointed at both ends, that is pivoted or freely suspended in a magnetic compass.
References in periodicals archive ?
The magnetic forces of the earth's big magnet pull and push on the magnetic needle until it also lines up north and south.
The geomagnetic field is dominated by a dipolar geometry with either a normal (north pole of the magnetic needle pointing toward the north geographic pole) or a reversed (north pole pointing toward the south geographic pole) polarity.
Senior Scientific's nanotechnology uses a magnetic needle and targeted magnetic nanoparticles that improve determination of Minimum Residual Disease (MRD) by orders-of-magnitude.