| http://www.w3.org/ns/prov#value | - FIG. 2 is a schematic cross sectional view of the electric potential sensor of the first embodiment, showing the structure of the substrate 100 and its surroundings in detail when the chopper 104 of the electric potential sensor is in a neutral state (where the two movable pieces of the chopper are not displaced and the front ends thereof are separated from each other by an appropriate gap).
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