How change dipole moment of this N terminal?

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MrGenetic
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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.
 
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