reluctance
re.luc.tance \ri-'l*k-t*n(t)s\ n 1: the quality or state of being reluctant 2: the opposition offered by a magnetic substance to magnetic flux; spec if : the ratio of the magnetic potential difference to the corresponding flux
re.luc.tance \ri-'l*k-t*n(t)s\ n 1: the quality or state of being reluctant 2: the opposition offered by a magnetic substance to magnetic flux; spec if : the ratio of the magnetic potential difference to the corresponding flux