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**electron together**

2 electrons are fired at speed

*v*towards one another. Knowing that each electron has a charge of

*e*an mass

*m*, what is the minimum distance that the two electrons will reach after fired at one another?

My book has a different answer than me so I have to check with you guys.

I wrote, -dE = dEk

-(E2 - E1) = (Ek2 - Ek1) - Ek2 is zero to for minimizing radius, and we assume E1 to be zero.

E2 = Ek1

2ke^2/r =mv^2

2ke^2 / mv^2 = r

Now in our book, they had this question with numbers, i derived this formula and plugged in my values and it didn't match the answer in the book.

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