Magnetic Field Generator

Magnets or magnetized and unmagnetized pieces of iron are constituted of molecules that themselves have magnetic character. Each elementary magnet possesses a north pole and a south pole.

The reason why an unmagnetized piece of iron does not exhibit magnetic properties or doesn’t generate magnetic field is that different molecular magnets form pole of one of the molecular magnets on a neighboring molecular magnet is exactly counterbalanced by the opposite pole of the other molecular magnet situated much closed to it for magnetic field. Please express your views of this topic Dipole Magnetic Field by commenting on blog.

The process of magnetization or generating magnetic field does not create any magnetism in the magnetized body but rearranges the molecular magnets. As a magnet is rubbed along an iron bar the molecular magnets are forced to break up their closed groups, lose magnetic field and tend to arrange themselves in an end to end sequence so that the north pole of every molecular magnet is situated close to the south pole of another molecular magnet.


How magnetic field is generated


At every stroke of the magnetizing magnet greater and greater number of molecular magnets arranges themselves in continuous chain along the direction of the stroke. Ultimately a stage is reached when all molecular magnets get arranged in row parallel to the magnet with the same free pole of the molecular magnets situated at same end of each row. All these free molecular polarities situated at each extremity of the magnetized piece North Pole at one end and the South Pole at the other.


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Soft iron can be easily magnetized even by a weak magnetic field, whereas steel can be magnetized only by a strong magnetic field. Therefore, less energy is required for magnetizing soft iron. Soft iron loses its magnetism immediately, whereas steel retains its magnetism.

It is observed that if a magnet is subjected to rough treatment such as dropping from a height or hammering then it gradually loses part or whole of its magnetism.