quadrant electrometer

noun

Definition of quadrant electrometer

: a sensitive electrometer consisting of a needle independently charged and suspended within a flat cylindrical metal box divided into four quadrants, those diametrically opposite being connected to each other and each pair being connected to one of two bodies whose potential difference is to be measured by means of the deflection of the needle toward one pair of quadrants through an angle approximately proportional to the difference of potential

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