In
physics, two systems are
coupled if they are
interacting with each other. Of special interest is the coupling of two (or more) vibratory systems (e.g.
pendula or
resonant circuits) by means of
springs or
magnetic fields, etc. Characteristic for a
coupled oscillation is the effect of
beat.
The concept of coupling is particularly important in physical cosmology, in which various forms of matter gradually decouple and recouple between each other.
Coupling is also important in physics for the generation of plasmas. In electrical discharges, the coupling of an exciting field and a medium creates plasmas. The quality of the coupling of an exciting field of given frequency to a charged particle depends on resonance.
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