Why Does an Electron Slow Down Near a Charge?

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An electron moving towards a charge slows down, but the identity of the source charge cannot be determined solely from its direction of movement. The slowing down indicates that the source charge is likely an electron, as the interaction would cause a repulsive force. The discussion also raises the question of whether an electron slows down when approaching a proton, particularly in the context of orbital motion. In this scenario, while an electron may lose kinetic energy as it approaches a proton, it does not slow down in the same way as it would with another electron. Overall, the dynamics of electron movement depend on the nature of the charge it interacts with.
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Question: An electron is moving towards a source charge, and slows down. What is the source charge (a proton or an electron)?

I feel like this question is pretty vague (because it says it moves towards the charge (making me think proton), but yet it slows down (making me think electron)) and I'm wondering how you guys would answer it.
 
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You cannot infer the identity of the source charge from the fact that an electron is moving towards it. It could be moving towards it due to some external agent. You can only infer the identity of the source charge from the fact that it slows down.
 
So it would be an electron.

Does an electron ever slow down as it approaches a proton in terms of it slowing down to fall into orbit?
 

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