səpˈoʊz ðɛɹˌɑːɹ pˈɔɪnt tʃˈɑːɹdʒᵻz ɚɹˈeɪndʒd ɪn θɹˈiːdᵻmˈɛnʃənəl spˈeɪs, ænd ðə tˌiːˈeɪtʃ pˈɔɪnt tʃˈɑːɹdʒ hɐz tʃˈɑːɹdʒ ænd ɪz loʊkˈeɪɾᵻd æt pəzˈɪʃən ˈɪn .
Suppose there are  point charges arranged in three-dimensional space, and the -th point charge has charge  and is located at position  in .