The reluctance offered to the stator flux by two small air gaps in series with high permeability iron, in reluctance machine is minimum, when the space angle θr = ___________
(a) 0°
(b) 45°
(c) 90°
(d) 270°
This question was posed to me during an interview for a job.
The doubt is from Reluctance Motor in division Basic Concepts in Rotating Machines of Electrical Machines