Correct option is C
· The property of a magnetic circuit that opposes the flow of magnetic flux lines is called reluctance. Reluctance is analogous to resistance, which is the property of an electric circuit that opposes the flow of electric flux lines.
· Reluctance is equal to the ratio of magnetic carrier force to magnetic flux. It depends on the length, area, and nature of the material. It is directly proportional to the length of the path and inversely proportional to its cross-sectional area and permeability.
· The reciprocal of reluctance is called permeance, which is a measure of how easily flux can be set up in a material. The SI unit of magnetic permeance is Weber per ampere-turn (H).
