Properties of Magnetic Circuits
There are two major properties of magnetic circuits namely magnetic flux and magnetomotive force . We will discuss them here.
1. Magnetic Flux
Magnetic Flux is the term used for defining magnetic induction in magnetic circuits. It is often referred to when discussion is about strength of magnetic field in a particular region. Formally magnetic flux can be defined as a quantitative measure of magnetic field lines passing through a given region. It is generally represented by symbol Φ and can be written as
Φ = B⋅A⋅cos(θ)
Φ is the magnetic flux measured in Weber (Wb), B is the magnetic field strength measured in Tesla (T), A is the area of magnetic field lines measured in square meters (m²), θ is the angle between the magnetic field lines and the normal to the surface.
2. Magnetomotive Force (MMF)
This concept comes into picture when we talk about maintaining magnetic flux in a magnetic circuit. Similar to electromotive force in electrical circuits we talk about MMF as an analogous force. This is an important force that helps in sustaining the magnetic circuit. Formally, It is the total magnetic potential difference in a magnetic circuit and which performs the task of maintaining magnetic flux in a magnetic circuit. It can be written as
F = N⋅I
F is the magnetomotive force in ampere-turns, N is the number of turns of the coil or winding, I is the current flowing through the coil in amperes.
Magnetic Circuits
Till now we have talked about standard circuits like linear and non-linear circuits but in the electronics industry, there are another kind of circuits called ‘magnetic circuits’. These circuits like any other circuits have a closed path but the path is followed by magnetic lines of forces creating a field of magnetic flux instead of a flowing current. In this article, we will study what are magnetic circuits, and what components make up the circuit. We will also represent the equation used to represent these circuits mathematically. Later we will discuss the need of having magnetic circuits and some applications of magnetic circuits in everyday life. We will conclude the article by summing up what we have learned. The electronics industry especially the communication system uses these signals in various circuits and readers can read about these other signals as well.