Electron deflection in an oscilloscope This problem deals with several aspects of an oscilloscope. You have an 15100 volt supply (Vsupply) for accelerating electrons to a speed adequate to make the front phosphor-coated screen glow when the electrons hit it. Once the electron has emerged from the accelerating region, it coasts through a vacuum at nearly constant speed. You can apply a potential difference of plus or minus 31 volts (Vplates) across the deflection plates to steer the electron beam up or down on the screen to paint a display (other deflection plates not shown in the diagram are used to steer the beam horizontally) Each of the two deflection plates is a thin metal plate of length L 8 cm and width (into the diagram) 4 cm. The distance between the deflection plates is s = 5 mm. The distance from the deflection plates to the screen is d24 cm. Accelerating plates Deflection plates Hot filament vertical scalc) (not to scale) Phosphor-coated screen glows when hit by electrons When there is a 31 volt potential difference between the deflection plates, what is the deflection y of the electron beam where it hits the screen? An approximate treatment is fine, but state your assumptions. As is usually the case, it pays to carry out all of your calculations algebraically and only evaluate the final algebraic result numerically. Note the exaggerated vertical scale: the deflection is actually small compared to the distance to the screen. Read the eBook Section 17.3 Submit Answer Save Progress Show transcribed image text

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