ðə pˈɑːɹɾɪkəlz ɹˈeɪdɪəs ʌv kˈɜːvətʃɚɹ ɪz pɹəpˈoːɹʃənəl tʊ ɪts moʊmˈɛntəm pˌɜːpəndˈɪkjʊlɚ tə ðə bˈiːm ˈaɪ.ˈiː. tɹænsvˈɜːs moʊmˈɛntəm ɔːɹ ɐkˈoːɹdɪŋ tə ðə fˈɔːɹmjʊlə wˌɛɹ ɪz ðə pˈɑːɹɾɪkəlz tʃˈɑːɹdʒ ænd ɪz ðə mæɡnˈɛɾɪk ɪndˈʌkʃən, wˌaɪl ðə dᵻɡɹˈiː tʊ wˌɪtʃ ɪt dɹˈɪfts ɪnðə dᵻɹˈɛkʃən ʌvðə bˈiːm ˈæksɪs ɡˈɪvz ɪts moʊmˈɛntəm ɪn ðæt dᵻɹˈɛkʃən.
The particle's radius of curvature  is proportional to its momentum perpendicular to the beam (i.e. transverse momentum or ) according to the formula  (where  is the particle's charge and  is the magnetic induction), while the degree to which it drifts in the direction of the beam axis gives its momentum in that direction.