Magnetic Hysteresis

 👉 Introduction:-

•Magnetic hysteresis is an important phenomenon observed in ferromagnetic materials such as iron, cobalt and nickel. It explains the behavior of a magnetic material when it is magnetized and demagnetized repeatedly. The term “hysteresis” means “lagging behind.” In this process, the magnetization of a material does not immediately follow the applied magnetic field but lags behind it.

👉Magnetisation Process:-

•When a ferromagnetic material is placed inside an external magnetic field, the tiny magnetic domains inside the material start aligning in the direction of the field. As the strength of the magnetic field increases, more domains align themselves, and the material becomes strongly magnetized. At a certain stage, all domains become aligned and the material reaches magnetic saturation.

👉Retentivity and Coercivity:-

•If the external magnetic field is now reduced to zero, the material does not lose all of its magnetism immediately. Some magnetism still remains inside the material. This remaining magnetism is known as Retentivity, or remanence. To completely remove the magnetism, a reverse magnetic field must be applied. The amount of reverse magnetic field required to reduce the magnetization  to zero is called Coercivity.

👉Hysteresis Loop:-

           "Magnetic Hysteresis Loop Diagram"

•The relationship between magnetic field strength (H) and magnetization (B) is represented by a closed curve known as the hysteresis loop. This loop provides important information about the magnetic properties of a material. A narrow hysteresis loop indicates that the material loses less energy and is suitable for transformer cores. A wide hysteresis loop shows high energy loss and is useful for making permanent magnets.

👉Hysteresis Loos:-

•During the process of repeated magnetization and demagnetization, some energy is lost in the form of heat. This energy loss is called hysteresis loss. The area enclosed by the hysteresis loop represents the amount of energy lost during one complete cycle of magnetization.

👉Applications:-

•Magnetic hysteresis has many practical applications in daily life and technology. Soft magnetic materials with low hysteresis loss are used in transformers, electric motors and generators. Hard magnetic materials with high retentivity are used to make permanent magnets, loudspeakers and magnetic storage devices.

👉Conclusion:-

•Thus, magnetic hysteresis is an important concept in magnetism that helps us understand the magnetic behavior of materials and their industrial applications.

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