Homework Statement
By what factor must you change the distance between two point charges to change the force between them by a factor of ten?
Homework Equations
F1=kq1/r^2
F2=kq2/r^2
The Attempt at a Solution
F1:F2= 10
r1/r2=sq.root(F2/F1)= 1/sqroot10
I do not understand...