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A resistor-capacitor circuit is shown to decay non-exponentially and to haveunequal currents flowing into and out of the capacitor. Relaxation of thestored energy can involve multiple sequential relaxation processes (withdramatically different time constants), separated by a transition region thatinvolves a change in current direction. This is demonstrated using a vacuumcapacitor to eliminate the effect of a dielectric between the plates (althougha ceramic capacitor shows a similar effect). A possible mechanism for such aresponse is illustrated in a related decay of polypropylene capacitors.

Energy relaxation in a vacuum capacitor: sequential time constants and unequal currents entering and leaving the capacitor