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A positively charged oil drop is injected into a region of uniformelectric field between two oppositely charged, horizontallyoriented plates spaced 16 cm apart. If the electric force on thedrop is found to be 7.8 x 10^-16 Nand the electric field magnitude is 555 V/m, what is the magnitude of the charge onthe drop in terms of the elementary charge e? Ignorethe small buoyant force on the drop.

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