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# An Ink-Jet Printer

EANDM-HFROPM

The figure illustrates a deflecting electrode system in an ink-jet printer. Assume that the ink droplets have a mass $m=10^{-10}$ kg, and carry a charge $q=-10^{-13}$ C. Assume that the ink droplets enter the deflecting plate with a speed of 20 m/s.

What is the vertical deflection $D$ of the droplets if the plates have length $L=1.5$ cm and the electric field between the plates is $10^6$ N/C?

A

13 cm

B

0.01 mm

C

1 cm

D

0.27 mm