longitudinal quadrupole

longitudinal quadrupole

[‚län·jə′tüd·ən·əl ′kwäd·rə‚pōl]
(acoustics)
A sound source resulting from a variation of a component of the velocity of matter in a direction parallel to the velocity component.
(electromagnetism)
An electric or magnetic quadrupole which produces a field equivalent to that of two equal and opposite electric or magnetic dipoles separated by a small distance parallel to the direction of the dipoles. Also known as axial quadrupole.
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