The ink drops have a mass m times kg each and leave the nozzle and travel horizontally toward the paper at velocity v ms The drops pass through a charging unit that gives each drop a positive charge q by causing it to lose some electrons. The drops then pass between parallel deflecting plates of length D cm where there is a uniform vertical electric field with magnitude E times NC Figure

Part A

If a drop is to be deflected a distance d mm by the time it reaches the end of the deflection plate, what magnitude of charge q must be given to the drop? Assume that the density of the ink drop is kgm and ignore the effects of gravity.