In an inkjet printer, letters are built up by squirting drops ofink at the paper

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In an inkjet printer, letters are built up by squirting drops ofink at the paper from a rapidly moving nozzle. The pattern on thepaper is controlled by an electrostatic valve that determines ateach nozzle position whether ink is squirted onto the paper or not.The ink drops, 14.9 mm in radius, leavethe nozzle and travel toward the paper at 18.9 m/s. The drops passthrough a charging unit that gives each drop a positive chargeq when the drop loses some electrons. The drops then passbetween parallel deflecting plates 2 cm in length where there is auniform vertical electric field with magnitude 73000 N/C. If a dropis to be deflected 0.3 mm by the time it reaches the end of thedeflection plate, what magnitude of charge must be given to thedrop? (Assume that the density of the ink drop is the same as thatof water, 1000 kg/m^3.)

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