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Homework Help: Changes in Capacitance During Discharge of Parallel Plate Capacitor

  1. Jul 22, 2012 #1
    1. The problem statement, all variables and given/known data
    I've been studying the changes in capacitance (presumably due to fringe capacitance) as a parallel plate capacitor discharges.

    The data is entirely as I would expect, excluding the last few data points, which were taken at voltages less than two mV. The capacitance shows exponential decay until the roughly 2 mV point is reached; after this point, the capacitance increases rapidly.

    2. Relevant equations
    V = V(initial)*e^(t/RC)

    3. The attempt at a solution

    My primary speculation is that this anomaly is related to the resistor (5G ohm) and the low voltage.

    Any suggestions would be appreciated.
  2. jcsd
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