with Jf the "free" or "conduction" current density.
w ɪ ð WORD_BOUNDARY d̠ʒ eɪ ɛ f WORD_BOUNDARY ð ə WORD_BOUNDARY f ɹ iː WORD_BOUNDARY ɔ ɹ WORD_BOUNDARY k ə n d ʌ k ʃ ə n WORD_BOUNDARY k ɜː ɹ ə n t WORD_BOUNDARY d ɛ n s ɪ t i WORD_BOUNDARY