# Magnetic Circuit

## Magnetic Permeability

Definition: The magnetic permeability is defined as the property of the material to allow the magnetic line of force to pass through it. In other words, the magnetic material can support the development of the magnetic field. The magnetic line of force is directly proportional to the conductivity of the material. Their SI unit is Henry …

## Magnetic Hysteresis

The phenomenon of flux density B lagging behind the magnetizing force H in a magnetic material is known as Magnetic Hysteresis. The word Hysteresis is derived from the Greek word Hysterein means to lag behind. In other words, when the magnetic material is magnetized first in one direction and then in the other direction, completing …

## Eddy Current Loss

When an alternating magnetic field is applied to a magnetic material, an emf is induced in the material itself according to Faraday’s Law of Electromagnetic induction. Since the magnetic material is a conducting material, these EMFs circulate current within the body of the material. These circulating currents are called Eddy Currents. They will occur when …

## Residual Magnetism

Residual magnetism is defined as the amount of magnetization left behind after removing the external magnetic field from the circuit. In other words, the value of the flux density (ob as shown in the figure with the red colour line) retained by the magnetic material is called Residual Magnetism and the power of retaining this …

## Hysteresis Loss

Definition: The work done by the magnetising force against the internal friction of the molecules of the magnet, produces heat. This energy which is wasted in the form of heat due to hysteresis is called Hysteresis Loss.  When in the magnetic material, magnetisation force is applied, the molecules of the magnetic material are aligned in …

## Parallel Magnetic Circuit

Definition: A magnetic circuit having two or more than two paths for the magnetic flux is called a parallel magnetic circuit. Its behaviour can be compared to the parallel electric circuit. The parallel magnetic circuit contains different dimensional areas and materials having various numbers of paths. The above figure shows a parallel magnetic circuit. In …

## Series Magnetic Circuit

Definition: The Series Magnetic Circuit is defined as the magnetic circuit having a number of parts of different dimensions and materials carrying the same magnetic field. Consider a circular coil or solenoid having different dimensions as shown in the figure below: Current I is passed through the solenoid having N number of turns wound on …

## Mutual Inductance

Definition: Mutual Inductance between the two coils is defined as the property of the coil due to which it opposes the change of current in the other coil, or you can say in the neighbouring coil. When the current in the neighbouring coil changes, the flux sets up in the coil and because of this, …

## Self Inductance

Definition: Self-inductance or in other words inductance of the coil is defined as the property of the coil due to which it opposes the change of current flowing through it. Inductance is attained by a coil due to the self-induced emf produced in the coil itself by changing the current flowing through it. If the …

## Leakage Flux And Fringing

Leakage flux is defined as the magnetic flux which does not follow the particularly intended path in a magnetic circuit. Taking an example of solenoid you can explain the leakage flux and the fringing both. When a current is passed through a solenoid, magnetic flux is produced by it. Most of the flux is set …