A box movers 5m horizontal when force f=10N is applied at an angle 60 degrees. what is the work done on the box by F during the displacement?

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.