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Q1 [1pt] : A fingerprint imager consists of a two-dimensional array of capacitive sensor cells constructed to record an electrical representation of a fingerprint (Fig. 1). Each sensor cell is composed of an adjacent-plates capacitor connected to a capacitance measurement circuit (Fig. 1). The entire surface of the imager is covered by a thin layer of nonconductive oxide. When the finger is placed on the oxide surface, it perturbs the field lines of the individual sensor cells to varying degrees, depending on the distance between the ridges and valleys of the finger's surface from the sensor cells. Sketch directly on Fig. 1, the electric field lines from the 2 adjacent-plate capacitors represented, assuming the ridge with a permittivity of $60\epsilon_o$, and the valley with a permittivity of $\epsilon_o$.

          Q1 [1pt] : A fingerprint imager consists of a two-dimensional array of capacitive sensor cells constructed to record an electrical representation of a fingerprint (Fig. 1). Each sensor cell is composed of an adjacent-plates capacitor connected to a capacitance measurement circuit (Fig. 1). The entire surface of the imager is covered by a thin layer of nonconductive oxide. When the finger is placed on the oxide surface, it perturbs the field lines of the individual sensor cells to varying degrees, depending on the distance between the ridges and valleys of the finger's surface from the sensor cells. Sketch directly on Fig. 1, the electric field lines from the 2 adjacent-plate capacitors represented, assuming the ridge with a permittivity of $60\epsilon_o$, and the valley with a permittivity of $\epsilon_o$.

Q1 [1pt] : A fingerprint imager consists of a two-dimensional array of capacitive sensor cells constructed to record an electrical representation of a fingerprint (Fig. 1). Each sensor cell is composed of an adjacent-plates capacitor connected to a capacitance measurement circuit (Fig. 1). The entire surface of the imager is covered by a thin layer of nonconductive oxide. When the finger is placed on the oxide surface, it perturbs the field lines of the individual sensor cells to varying degrees, depending on the distance between the ridges and valleys of the finger's surface from the sensor cells. Sketch directly on Fig. 1, the electric field lines from the 2 adjacent-plate capacitors represented, assuming the ridge with a permittivity of 60, and the valley with a permittivity of .

Added by Mark W.

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