Which of the following relations is correct?
A
NI = Sφ
B
NS = Iφ
C
Nφ = SI
D
NI = S/φ
Correct Answer: NI = Sφ
The reluctance is also defined by the ratio of the current element to the flux. In other words, mmf = NI. Thus S = NI/φ. We get the relation NI = Sφ.