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What is Hysteresis Loop? What is its significance?
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6 years ago

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```										When a specimen of magnetic material is magnetised, a curve is drawn for magnetic field intensity (H) against intensity of magnetisation (I). The curve so formed is called Hysteresis Loop. This complete process is called Cycle of Magnetisation. It is called hysteresis because of lagging of I behind H during the cycle of magnetisation.
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6 years ago
```										Dear krishna,

The loop is generated by measuring the magnetic                  flux  of a ferromagnetic material while the magnetizing                  force  is changed. A ferromagnetic material that has never                  been previously magnetized or has been thoroughly demagnetized                  will follow the dashed line as H is increased. As the line                  demonstrates, the greater the amount of current applied (H+),                  the stronger the magnetic field in the component (B+).                  At point "a" almost all of the magnetic domains are                  aligned and an additional increase in the magnetizing force will                  produce very little increase in magnetic flux. The material has                  reached the point of magnetic saturation. When H is reduced                  to zero, the curve will move from point "a"                  to point "b." At this point, it can be seen that some                  magnetic flux remains in the material even though the magnetizing                  force is zero. This is referred to as the point of retentivity                  on the graph and indicates the remanence or level of residual                  magnetism in the material. (Some of the magnetic domains remain                  aligned but some have lost their alignment.) As the magnetizing                  force is reversed, the curve moves to point "c", where                  the flux has been reduced to zero. This is called the point of                  coercivity on the curve. (The reversed magnetizing force has flipped                  enough of the domains so that the net flux within the material                  is zero.) The force required to remove the residual magnetism                  from the material is called the coercive force or coercivity                  of the material.
As the magnetizing force is increased in the negative                  direction, the material will again become magnetically saturated                  but in the opposite direction (point "d"). Reducing                  H to zero brings the curve to point "e." It will                  have a level of residual magnetism equal to that achieved in the                  other direction. Increasing H back in the positive direction                  will return B to zero. Notice that the curve did not return                  to the origin of the graph because some force is required to remove                  the residual magnetism. The curve will take a different path from                  point "f" back to the saturation point where it with complete                  the loop.

We are all  IITians and here to help you in your IIT  JEE preparation.  All the best.
Sagar Singh
B.Tech IIT Delhi

```
6 years ago

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