Question

What is the meaning of dipole moment?

Answer 1

Dipole moment $\left(\mu \right)$ is the measure of net molecular polarity, which is the magnitude of the charge Q at either end of the molecular dipole times the distance r between the charges.
$\mu =Q\times r$
Dipole moments tell us about the charge separation in a molecule. The larger the difference in electronegativities of bonded atoms, the larger the dipole moment.