How change dipole moment of this N terminal?

[MrGenetic]

When the aminoacid environment were changed with adding OH or etc., Aminoacid N terminal were affected by H amount and in determined pKa, they loose hydrogen from N terminal. NH3 goes Nh2. My question is related to this. While this event occur, how change dipole moment of this terminal? Electron pair shift to top on N atom but H atom losted. I did not understand exactly how affect the dipole moment.

 

[Borek]

Sorry, this is completely unreadable.