Well, there are two problems, both of which would allow me to receive extra credit in my college physics class! Both are rather descriptive, so I have linked an image to it.
For the first, I was considering the formula for electric field within a uniformly charged sphere (E= Qr/4pi[tex]\epsilon[/tex]R^3), and was thinking maybe some potential equations could come into play. (tex]\Delta[/tex]V = INT(E dl)
For the second, I was rather clueless. The wording was ambiguous and vague, or rather I didn't under stand it :p
I thought perhaps Force plays into this due to deflection of particles. Also, since we are given an initial velocity(? are we lol), Potential and momentum can come into play
U = kqq/r
Conservation of momentum.
The Attempt at a Solution
For the first, I couldn't quite break it down in any manner, and decided the field would be zero.
The second, I didn't understand if they touched, or if they didn't. I thought d was the closest they could have gotten, or maybe they repel each other, and the distance with which they are closest is when their potential energy is the greatest (KE'+UE' = KE"+UE")
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