Acoustic Dipole
This can be considered as two equal strength monopoles that are out of phase and a small distance apart. There is no net introduction of fluid by a dipole. As one source exhales, the other source inhales and the fluid surrounding the dipole simply sloshes back and forth between the sources. It is the net force on the fluid which causes energy to be radiated in the form of sound waves.

Electric Dipole
A pair of equal yet opposite electrical charges that are separated by a small distance.

See also: Dipole-Dipole Interaction.

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Subjects: Physics