Lub sijhawm sib nqus dipole yog vector, kev taw qhia yog los ntawm qhov tsis zoo sib nqus mus rau qhov zoo sib nqus. Sib raug rau "hluav taws xob dipole caij". Keeb kwm, tib neeg thawj zaug xav tias cov hlau nplaum ntuj (los yog cov hlau nplaum dag) tau tsim los ntawm cov hlau nplaum me me uas suav tsis txheeb, txhua tus uas muaj qhov sib npaug ntawm qhov zoo thiab qhov tsis zoo ntawm cov hlau nplaum uas nyob ze rau ib leeg.
