* Electronegativity: Nitrogen is more electronegative than hydrogen. This means nitrogen has a stronger pull on the shared electrons in the bond.
* Electron Density: As a result, the shared electrons spend more time closer to the nitrogen atom, creating a partial negative charge (δ-) on the nitrogen and a partial positive charge (δ+) on the hydrogen.
* Dipole Moment: This difference in charge creates a dipole moment, which is a vector pointing from the positive to the negative end.
Therefore, the dipole moment in a N-H bond points towards the nitrogen atom.