The deuteron is bound by nuclear forces just as H-atom is made up...

The deuteron is bound by nuclear forces just as H-atom is made up of p and e bound by electrostatic forces. If we consider the force between neutron and proton in deuteron as given in the form of a Coulomb potential but with an effective charge e′:

What is the estimated value of the ratio (e'/e) if the binding energy of a deuteron is 2.2 MeV?