In an ink-jet printer, drops of ink are given a controlledamount of charge before they pass through a uniform electric fieldgenerated by two charged plates. If the electric field between theplates is 1.5x106N/C over a region 1.20cm long, and drops of mass0.12nanograms enter the electric field region moving horizontallyat 10m/s, (a) how much charge on a drop is necessary to produce avertical deflection of 0.50mm at the end of the electric field? (b)What is the vertical deflection between the point where it leavesthe plates and where it strikes the paper, if the paper is 0.50cmfrom the end of the charged plates? Ignore other forces such asgravity and air resistance, and assume the field between the platesis vertical and constant, and drops abruptly to zero at the edge ofthe plates. (a) C (b) cm
