Dipole moment

The electric dipole moment is a measure of polarity. It is the second term in a multipole expansion of a field (the first one being the monopole, or Coulombic, term.) Its definition, for a system of point charges, is $\mathbf {p} =\sum _{i=1}^{N}\,q_{i}\,\mathbf {r} _{i}.$

Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle 3.33564\times 10^{-33}}

For molecular systems, it is customarily given in units of Debyes, after the physicist Peter J. W. Debye. In SI units, Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle 1} D equals approximately Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle 3.33564\times 10^{-30}} Coulomb-meter (exactly Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle 10^{-21}} C m$^{2}$/s divided by $c$, the speed of light in vacuum). Conversely, 1 C m = $2.997910^{29}$D.