# Explain, briefly, what a hysteresis cycle is

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In summary, a hysteresis cycle refers to the behavior of a ferromagnetic material when subjected to a changing magnetic field. It involves the material's magnetization tracing out a loop, known as a hysteresis loop, which is caused by the presence of magnetic domains in the material. This phenomenon is important in understanding electricity and magnetism.
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## Homework Statement

explain, briefly, what a hysteresis cycle is [2 marks]

## The Attempt at a Solution

I don't think the answer is to draw a graph because that is the next question. The subject is electricity and magnetism but the above question does not refer specifically to electricity and magnetism. I have looked things up in books and the internet, but none of them will define the hysteresis cycle briefly, they all write paragraphs

When a ferromagnetic material is magnetized in one direction, it will not relax back to zero magnetization when the imposed magnetizing field is removed. It must be driven back to zero by a field in the opposite direction. If an alternating magnetic field is applied to the material, its magnetization will trace out a loop called a hysteresis loop. The lack of re-traceability of the magnetization curve is the property called hysteresis and it is related to the existence of magnetic domains in the material.

## 1. What is a hysteresis cycle?

A hysteresis cycle is a graphical representation of the relationship between two variables, where the value of one variable depends on the value of the other. It is typically shown as a loop or curve on a graph.

## 2. How is a hysteresis cycle used in science?

In science, hysteresis cycles are used to study and understand the behavior of systems that exhibit memory or lag effects. This includes phenomena such as magnetism, elasticity, and chemical reactions.

## 3. What causes hysteresis?

Hysteresis is caused by the presence of energy barriers that prevent the system from immediately responding to changes in the input variable. This can be due to factors such as friction, inertia, or internal resistance in the system.

## 4. Can you give an example of a hysteresis cycle?

One example of a hysteresis cycle is the magnetization curve of a ferromagnetic material. As an external magnetic field is applied, the material will become magnetized, but when the field is removed, the material will retain some of its magnetization. The hysteresis cycle shows the relationship between the external magnetic field and the resulting magnetization of the material.

## 5. Is hysteresis always present in systems?

No, hysteresis is not always present in systems. It depends on the specific properties and characteristics of the system. Some systems may exhibit hysteresis, while others may not show any memory or lag effects.

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