Homework Answers
By conservation of energy
1/2mv^2+kq1q2/r=kq1q2/r'
k=9*10^9Nm^2/C^2
Substituting values
m=6.64*10^-27kg
q1=2e
q2=79e
v=1.9*10^7m/s
r=1m
we get r'=303.866*10^-14m
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