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 __________.
- $0.9$
- $1.0$
- $1.1$
- $2$