curve fitting estimate parameter - inverse square law

Question

I want to make a plot force vs position (for coulomb\'s law) and estimate the constant e0. I have the values of charges , q1=1,q2=1. I have for example the

pos         


        

Answer 1

Since a= (q1*q2/4*pi*e0), e0 should be

e0=a/(q1*q2/4*pi)

Check it.