In many keyboards, the key switches are built as air-filled parallel-plate capacitors witha spacing that decreases when the key is pressed. This change in spacing increases thecapacitance, which connected circuitry registers as a keypress. Suppose the plate areaon a key is 44.8 mm2 and the unpressed plate separation is 0.63 mm. If the circuitryregisters a keypress when the capacitance changes by 0.476 pF, calculate the distance(in mm) the key must travel to register a keypress.

The capacitance of parallel plate capacitor is given as C=Aεod Where A,d are plate area and…

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