What is the retentivity of soft iron?
Soft iron have a low retentivity in general. I know that your concern comes from the comparison of the hysterisis curves of soft iron and steel. Soft iron has a retentivity higher than that of steel, but that so called “higher “ value is not high enough. Hence it is fit for using as the core for an electromagnet.
Does soft iron has high or low retentivity?
The soft iron gets easily magnetised due to its high susceptibility and also loses its magnetism as soon as the induced magnetic field is removed because of its low-retentivity.
When the coercivity and retentivity of a magnetic material is large then they are called as — magnetic materials?
That is why; it is also called as permanent magnetic material. They have coercive force greater than 10kA/m and have high retentivity. When we expose a hard magnet to an external magnetic field for the first time, the domain grows and rotates to align with the applied field at the saturation magnetization.
What is retentivity and coercivity of ferromagnetic material?
Retentivity: The property of the magnetic material to retain magnetism even in the absence of the magnetizing field is known as retentivity or remanence. Coercivity: The magnetizing field (H) needed to demagnetize the magnetic material completely is known as its coercivity.
What is retentivity and coercivity of electromagnets?
The coercivity of an electromagnet should be low because if the coercivity is high then it will be difficult to control the magnetic field of the electromagnet. Retentivity: It is the ability of electromagnet which means that the electromagnet remains magnetized even after the removal of the magnetic field.
What does the retentivity and coercivity of a material signify about the material?
Retentivity—It is the property of a magnetic material by which magnetism is left in the specimen even when magnetising field is reduced to zero. Coercivity—It is the property of a magnetic material which depends upon reverse value of magnetising field required to reduce residual magnetism to zero.
What is coercivity matter?
Coercivity, also called the magnetic coercivity, coercive field or coercive force, is a measure of the ability of a ferromagnetic material to withstand an external magnetic field without becoming demagnetized.