wˌɛn ðə tʃˈɑːɹdʒd pˈɑːɹɾɪkəl bɪɡˈɪnz tʊ ɐpɹˈoʊtʃ ɹˌɛləɾɪvˈɪstɪk spˈiːdz, ðə sˈɛntɹaɪptəl fˈoːɹs ʃˌʊd biː mˌʌltɪplˈaɪd baɪ ðə lˈɔːɹɛnts fˈæktɚ, jˈiːldɪŋ ɐ kˌɔːɹɪspˈɑːndɪŋ fˈæktɚɹ ɪnðɪ ˈæŋɡjʊlɚ fɹˈiːkwənsi:
When the charged particle begins to approach relativistic speeds, the centripetal force should be multiplied by the Lorentz factor, yielding a corresponding factor in the angular frequency: