Final answer:
The bond dipole does not change when the electronegativity of atom A is moved to the center. When atom A becomes more electronegative, the bond dipole becomes stronger.
Step-by-step explanation:
When the electronegativity of atom A is moved to the center, the bond dipole does not change. The bond dipole represents the polarity of a covalent bond between two atoms, and it is determined by the difference in electronegativity between the two atoms. Moving the electronegativity cursor to the center does not affect the electronegativity difference between atom A and B, so the bond dipole remains the same.
When atom A is made more electronegative, the bond dipole becomes stronger. Electronegativity is the ability of an atom to attract electrons in a covalent bond. As atom A becomes more electronegative, it pulls the shared electrons closer to itself, creating a larger electronegativity difference with atom B. This increased electronegativity difference results in a stronger bond dipole.