Two plates charged with 2x10-C are placed horizontally, one at the bottom and the other at the top, both charged with signs. opposite and an

Two plates charged with 2x10-⁸C are placed horizontally, one at the bottom and the other at the top, both charged with signs. opposite and an area of 120cm². Calculate the charge that a 2 drop of oil must have 2x10-⁸ Kg to remain at rest between the sheets.