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A differential capacitive sensor with a distance between the extreme plates $100\;mm$ is shown in figure below. The difference voltage $\Delta V=V_1-V_2,$ where $V_1$ and $V_2$ are the rms values, for a downward displacement of $10\;mm$ of the intermediate plate from the central position, in volts, is __________.

  1. $0.9$
  2. $1.0$
  3. $1.1$
  4. $2$
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