ðə dɪtˈɛktɚz mæɡnˈɛɾɪk fˈiːld kˈɔːzᵻz ðə pˈɑːɹɾɪkəl tə ɹoʊtˈeɪt baɪ ɐksˈɛlɚɹˌeɪɾɪŋ ɪɾ ɪn ɐ dᵻɹˈɛkʃən pˌɜːpəndˈɪkjʊlɚ tʊ ɪts mˈoʊʃən vˈaɪə ðə lˈɔːɹɛnts fˈoːɹs.
The detector's magnetic field causes the particle to rotate by accelerating it in a direction perpendicular to its motion via the Lorentz force.