The Royal Spanish Academy (RAE) recognizes two meanings of the concept of reluctance. The first meaning indicates that the term can be used as a synonym for reluctance: the disgust or annoyance felt when having to perform a certain activity.
For instance: “My boss’s orders make me reluctant since he always asks me to do things that I don’t want to do”, “The reluctance of the players in the face of the coach’s instructions was evident”, “In military confrontations there is no room for reluctance: you have to abide by what the superiors say, period”.
On an emotional level, we can say that there are people who clearly manifest a reluctance not towards a specific event that happens to them but towards some feeling, value or “obligation” that exists in society. Thus, for example, we can underline that there are individuals who openly declare that they are reluctant to compromise in relationship matters.
There are many reasons that may have led them to take that position. However, among the most common are previous love experiences that caused them great pain or having grown up and lived in an environment where relationships did not come to fruition and were linked to great problems.
Reluctance, on the other hand, is linked to resistance exerted by a circuit or a material before a certain magnetic flux. This means that the circuit or material in question resists the passage of the magnetic flux, opposing its magnetomotive force.
It is a concept similar to that of electric resistance: in an electrical circuit, the stream follow the path of least resistance. In the case of a magnetic circuit, it is the magnetic flux that seeks to advance through the sector that exerts the least magnetic resistance (that is, that has the least reluctance).
As the reluctance of the material or circuit increases, more is needed Energy to achieve the passage of magnetic flux through it.
In addition to all the above, we cannot ignore the fact that reluctance, which is the relationship between magnetic flux and magnetomotive force, was a term that was coined in the 19th century. It was heard exactly for the first time in 1888 and was invented by the English physicist and mathematician Oliver Heaviside.
However, although it was the aforementioned scientist who coined it, it should not be overlooked that the one who took the first steps to discover reluctance as such was the Danish physicist Hans Christian Oersted, who as early as 1813 came to predict electromagnetic phenomena . Furthermore, his research and studies were the ones that led to the establishment of the foundations of electromagnetism. Precisely for all that, we have to show that the unit of reluctance is the Oersted, in homage to this man of science.
It is possible to calculate the magnetic reluctance from the following equation: reluctance (measured in ampere per weber) is equal to the length of the circuit over the magnetic permeability times the area of the magnetic core section.