HW 1 part 3

# HW 1 part 3 - Operation of an Inkjet Printer In an inkjet...

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Operation of an Inkjet Printer In an inkjet printer, letters and images are created by squirting drops of ink horizontally at a sheet of paper from a rapidly moving nozzle. The pattern on the paper is controlled by an electrostatic valve that determines at each nozzle position whether ink is squirted onto the paper or not. The ink drops have a mass = 1.00×10 −11 each and leave the nozzle and travel horizontally toward the paper at velocity = 15.0 . The drops pass through a charging unit that gives each drop a positive charge by causing it to lose some electrons. The drops then pass between parallel deflecting plates of length = 1.55 , where there is a uniform vertical electric field with magnitude = 7.50×10 4 .

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Part A If a drop is to be deflected a distance = 0.350 by the time it reaches the end of the deflection plate, what magnitude of charge must be given to the drop? Assume that the density of the ink drop is 1000 , and ignore the effects of gravity. Hint A.1 How to approach the problem Hint not displayed Hint A.2 Calculate the time spent between the plates Hint not displayed Hint A.3 Calculate the vertical acceleration Hint not displayed Hint A.4 Calculate the force that must be acting on the drop using Newton's law Hint not displayed Hint A.5 Relating the electric force and the electric field Hint not displayed Express your answer numerically in coulombs. ANSWER: = 8.74×10 −14 Correct Here is something to think about: Is it reasonable to ignore the effect of gravity on the droplet in our calculations? For an average inkjet printer, the magnitude of the acceleration due to the electric field will be over ten times larger than the magnitude of the acceleration due to gravity. However, gravity will still cause a small deflection of the droplet and hence should not be ignored if the accuracy of the placement of the ink droplet is particularly important. Electric Dipole in an Electric Field Point charges 4.70 and 4.70 are separated by distance 3.30 , forming an electric dipole.
Part A Find the magnitude of the electric dipole moment. Hint A.1 How to approach the problem Hint not displayed Hint A.2 Formula for dipole moment Hint not displayed Express your answer in coulomb meters to three significant figures. ANSWER:

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HW 1 part 3 - Operation of an Inkjet Printer In an inkjet...

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