magnetic needle


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magnetic needle

a slender magnetized rod used in certain instruments, such as the magnetic compass, for indicating the direction of a magnetic field
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The summing subscript <i, j> indicates the summation of all two adjacent small magnetic needles. We see that if [s.sub.i] = [s.sub.j], the total energy is reduced by J.
And since a ship's safety might depend on its magnetic needle, it also became a flogging offense for the helmsman to be caught eating anything with garlic in it.
Eventually a magnetic needle was put on a card marked with various directions, and because the needle was free to move all around the card, it was referred to as a magnetic compass (from a French word meaning "to go around").
Shagun Gupta has also certified tattoo removing technique, using magnetic needles TR88.