Basic Force Concepts Homework: Electron Held Stationairy in Electric Field

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SUMMARY

The discussion centers on the concept of an electron held stationary in a vacuum between two charged metal plates within an electric field. The forces acting on the electron, specifically the electric force and gravitational force, are balanced, resulting in zero acceleration. This balance allows the electron to maintain a constant velocity, which in this case is zero, confirming that being stationary is indeed a valid state of constant velocity.

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  • Understanding of electric fields and forces
  • Basic knowledge of Newton's laws of motion
  • Familiarity with the concept of velocity and acceleration
  • Knowledge of charge interactions (attraction and repulsion)
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Homework Statement


An an electric field.
An electron is held stationairy in a vacuum between two charges metal plates.
It is attracted to the positive plate since unlike charges attract. The weight of the electron balannces the electric force.

Now these two forces are balanced. Acceleration is 0 ms^-2
That would also mean the electron is moving with constant velocity. But if that's true, how could the electron be held stationairy?
 
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fffff said:
Now these two forces are balanced. Acceleration is 0 ms^-2
That would also mean the electron is moving with constant velocity. But if that's true, how could the electron be held stationairy?
You've made an erroneous leap there. Zero acceleration does not imply non-zero velocity. Consider yourself sat in your chair in front of your computer. Are you accelerating? Do you have a non-zero velocity?

Edit: Okay, Doc Al put it simpler than me :blushing:
 
Last edited:
fffff said:
That would also mean the electron is moving with constant velocity. But if that's true, how could the electron be held stationairy?
Not moving is a perfectly fine example of constant velocity! :wink: (The velocity is zero.)
 

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