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Your reasoning is correct, the capacitance increases if the conductor gets closer to the PCB. The system could be modeled as two capacitors in series, the fringing effects of current/field lines above the conductive plate could most likely be ignored (depends on how close other objects like a finger get to the top conductive plate, or if there is an ...


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Human flesh is a good dielectric material, because our body is largely made up of water. The dielectric constant of a vacuum is defined as 1, and the dielectric constant of air is only slightly higher. However, the dielectric constant of water is much higher, around 80. The interaction of the finger with the electric field of the capacitor thus increases the ...


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