An oil drop is found floating freely between the plates of a parallel plate condenser, the plates being horizontal

Hi, I have a question and I hope anyone could answer it:

An oil drop is found floating freely between the plates of a parallel plate condenser, the plates being horizontal and the lower plate carrying a charge +Q. The area of each plate is A and the distance of separation between them is D. The charge on the oil drop must be (g is the acceleration due to gravity)

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