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

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 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.
Each small magnetic needle is compared to a user in a social network.