This method mainly depends on the magnetic field of the material. Generally, by one method of remanence, you cannot identify the residual magnetism of all the magnetic materials as they are different in dimensions, shapes, and properties, thus to measure the residual magnetism of small magnetic particles isothermal Remanence is used. It is denoted by Mr, and it is sometimes also called as saturation Isothermal Remanence, denoted by Mrs. Saturation Remanence is the total magnetic moment per volume of the sample. The various types of Remanence are as followsĭetailed explanation of the various types of remanence is given below: This phenomenon of the residual magnetism is widely seen in the transformers, generators, and motors. This residual magnetism of the magnetic material is removed by applying magnetizing force (oc) called the coercive force in the opposite direction. When H is increased in the reverse direction, the flux density starts decreasing and become zero and the curve follows the path (bc) as shown in the figure below. Now to demagnetize the magnetic ring the magnetizing force H is reversed by reversing the direction of flow of the current, as discussed in the article ‘ Magnetic hysteresis‘. Magnetization occurs by applying the current in one direction, and the flux density is increased until the saturation point (a) is reached. ![]() 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 magnetism is called Retentivity of the material.
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