1202_LabManual.pdf

# Does the electric field vary in the region between

• Lab Report
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coordinate system if you have not already done so. Does the electric field vary in the region between the deflecting plates? What does that tell you about the acceleration of the electron in that region? 5. Use your drawing from step 1 and kinematics to determine the position and direction of the electron as it enters the region between the deflection plates and when it leaves that region. Write down an equation giving the electron’s change in position as it emerges from the deflecting plates (how much it was deflected while traveling between the plates). Write another equation giving the electron’s direction. 6. Use your drawing from step 1, the position and direction of the electron as it leaves the deflection plates, and geometry to write down an equation giving the position of the electron when it hits the screen. Use the deflection distance from each region to write an expression for the total deflection during the electron’s motion through all regions of the CRT. 7. Examine your equations giving the electron’s position at the screen. You know the total deflection in terms of the accelerating voltage, length of the deflecting plate region, distance from the plates to the screen, separation distance of the plates, and potential difference across the plates. Are there any other unknowns in your equation? Do you have enough equations to solve for the unknowns? If so, solve your equations algebraically for the deflection of an electron. If not, write down additional equations that relate some of the unknown quantities in your equations to quantities that you know. 8. Complete your solution by using the actual numbers that describe your situation. Refer to the distances shown on the diagram of the CRT in the appendix. Does your solution make sense? If not, check your work for logic problems or algebra mistakes. 111

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