Define dipolemoment write its applications.

Dipolemoment ( $\mathrm{\mu }$ ) :
The product of the magnitude of the charge on any one of the poles and distance between that poles in a polar molecule is called as dipolemoment.
$\mathrm{\mu }=\mathrm{\delta }\times \mathrm{d}$
$\mathrm{\mu }$ = dipolemoment ; $\mathrm{\delta }$ = charge
d = distance between two poles
Units - Debye; Coloumb meter (col. M)
1 D = 3.336x10^-30 (col. M)
Applications :
1) We can predict the nature of the compound.
If $\mathrm{\mu }=0\Rightarrow$ non polar compound
$\mathrm{\mu }\ne 0\Rightarrow$ polar compound.
2) We can calculate the percentage of ionic character of a polar compound
$\%\text{ of I.C }=\frac{{\mathrm{\mu }}_{\mathrm{obs}}}{{\mathrm{\mu }}_{\mathrm{cal}}}\times 100$
$\mathrm{\mu }$_obs  = observed dipole moment
$\mathrm{\mu }$_cal  = calculated dipole moment.