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```				   6.     The area of hysteresis loop of a material is equivalent to 250 Joule. When 10 kg material is magnetised by an alternating field of 50Hz then energy lost in one hour will be if the density of material is 7.5 gm/cm3.
(A)   6 × 104 Joule
(B)   6 × 104 Erg
(C)   3 × 102 Joule
(D)   3 × 102 Erg.

Correct answer is A.How is it obtained?

```

5 years ago

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```										Dear student,
The correct option in this case is b)
A hysteresis loop shows the relationship between the induced                  magnetic flux density (B) and the magnetizing force (H). It is often referred to as the B-H loop. An example hysteresis                  loop is shown below.

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.
```
5 years ago

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