One type of ink-jet printer, called an electrostatic ink-jet printer, forms the letters by using deflecting electrodes t

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One type of ink-jet printer, called an electrostatic ink-jet
printer, forms the letters by using deflecting electrodes to steer
charged ink drops up and down vertically as the ink jet sweeps
horizontally across the page. The ink jet
forms 35.0 μm-diameter drops of ink, charges them by
spraying 800,000 electrons on the surface, and shoots them toward
the page with a horizontal velocity
of 22.0 m/s. Along the way, the drops pass through
the long axis of two horizontal, parallel electrodes that
are 6.0 mm long, 4.0 mm wide, and
spaced 1.0 mm apart. The distance from the center of
the electrodes to the paper is 1.90 cm. To form the
letters, which have a maximum height of 6.0 mm, the
drops need to be deflected up or down a maximum
of 3.0 mm. Ink, which consists of dye particles
suspended in alcohol, has a density of 800 kg/m^3.
What electric field strength is needed between the
electrodes to achieve this deflection?
E = ?