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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 7.7*10^-16 N and the electricfield magnitude is 540 V/m, what is the magnitude of the charge on the drop in terms of theelementary charge e? Ignore the small buoyant forceon the drop.

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