In a modern printer, letters are built up by shooting tiny droplets of ink at th

Question

In a modern printer, letters are built up by shooting tiny droplets of ink at the paper. The pattern on the paper is controlled by a valve that determines whether ink is squirted onto the paper or not. The droplets have a radius of 13.0?m and leave the nozzle and travel toward the paper at a velocity of 16.0m/s . The drops are charged as they leave the nozzle with a positive charge q . The drops then pass between parallel deflecting plates of length 2.00cm where there is a uniform horizontal electric field with a magnitude of 7.90

Explanation / Answer

apply V^2 = 2aS

so axxleration a = V^2/2S

a = 16*16/(2*0.02))

a = 6400 m/s^2

noe use ma = Eq

mass = DV

mass = 1000* (4/3* 3.14 * 13*13*13*10^-18)

mass m = 9.17 *10^-12 Kgs

so charge q = 9.17*e-12 * 6400/7.9e4

q = 74.28 uC

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