What is the relation of the force and the air gap length in the flat faced plunger type?
(a) force is directly proportional to the air gap length
(b) force is indirectly proportional to the air gap length
(c) force is directly proportional to the square of the air gap length
(d) force is indirectly proportional to the square of the air gap length
I have been asked this question during an online exam.
The doubt is from Types of Electromagnets topic in portion Design of Electromagnets of Design of Electrical Machines