Increase the magnitude of the charge on both plates could decrease the field strength between the plates of two parallel plates having charges of equal magnitude but opposite sign.
Electric field strength is a quantitative expression of the intensity of an electric field at a particular location. The standard unit is the volt per meter (v/m or v · m -1). A field strength of 1 v/m represents a potential difference of one volt between points separated by one meter.
Any electrically charged object produces an electric field. This field has an effect on other charged objects in the vicinity. The field strength at a particular distance from an object is directly proportional to the electric charge, in coulombs, on that object. The field strength is inversely proportional to the distance from a charged object.
The field-strength-vs-distance curve is a direct inverse function, and not an inverse-square function, because electric field strength is specified in terms of a linear displacement (per meter) rather than a surface area (per meter squared).
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