What is the term for the resistance to magnetic flux?

The term for the resistance to magnetic flux is reluctance. This concept arises from the analogy of electrical resistance; just as resistance impedes the flow of electric current, reluctance hinders the flow of magnetic flux in a material. In magnetic circuits, reluctance is influenced by factors such as the material's magnetic properties and geometry, akin to how electrical resistance is affected by the conductor's material, length, and cross-sectional area.

Understanding reluctance is essential when dealing with magnetic circuits, as it plays a pivotal role in determining how effectively magnetic fields can be established and maintained within various materials and systems. This understanding is critical for tasks such as designing transformers, inductors, and magnetic sensors, ensuring that the intended performance of these devices is achieved.