Operation of an Inkjet Printer

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In an inkjet printer, letters and images are created by squirtingdrops of ink horizontally at a sheet of paper from a rapidly movingnozzle. The pattern on the paper is controlled by an electrostaticvalve that determines at each nozzle position whether ink issquirted onto the paper or not.

The ink drops have a mass m = 1.00×10−11 kg each and leave the nozzle andtravel horizontally toward the paper at velocity v = 25.0 m/s. The drops pass through a charging unitthat gives each drop a positive charge q by causing it to lose some electrons. The dropsthen pass between parallel deflecting plates of length D_0 = 2.20 cm, where there is a uniform vertical electricfield with magnitude E = 8.10×104 N/C.
If a drop is to be deflected a distance d = 0.270 mm by the time it reaches the end of thedeflection plate, what magnitude of charge q must be given to the drop? Assume that thedensity of the ink drop is 1000 kg/m^3, and ignore the effects ofgravity


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  • Anonymous
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